20303020 has 72 divisors (see below), whose sum is σ = 47381040. Its totient is φ = 7286400.

The previous prime is 20303011. The next prime is 20303027. The reversal of 20303020 is 2030302.

20303020 = T₅₉ + T₆₀ + ... + T₄₉₅.

It is a super-2 number, since 2×20303020² = 824425242240800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20302988 and 20303006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200970 + ... + 201070.

It is an arithmetic number, because the mean of its divisors is an integer number (658070).

Almost surely, 2^20303020 is an apocalyptic number.

20303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20303020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23690520).

20303020 is an abundant number, since it is smaller than the sum of its proper divisors (27078020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20303020 is a wasteful number, since it uses less digits than its factorization.

20303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 10.

The square root of 20303020 is about 4505.8872600188. The cubic root of 20303020 is about 272.8057673723.

20303020 divided by its sum of digits (10) gives a palindrome (2030302).

Adding to 20303020 its reverse (2030302), we get a palindrome (22333322).

It can be divided in two parts, 2030 and 3020, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 20303020 in words is "twenty million, three hundred three thousand, twenty".