20173020 has 96 divisors (see below), whose sum is σ = 66114048. Its totient is φ = 4499712.

The previous prime is 20172989. The next prime is 20173051. The reversal of 20173020 is 2037102.

It is an interprime number because it is at equal distance from previous prime (20172989) and next prime (20173051).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 17502 + ... + 18618.

It is an arithmetic number, because the mean of its divisors is an integer number (688688).

Almost surely, 2^20173020 is an apocalyptic number.

20173020 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 20173020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33057024).

20173020 is an abundant number, since it is smaller than the sum of its proper divisors (45941028).

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

20173020 is a wasteful number, since it uses less digits than its factorization.

20173020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 20173020 is about 4491.4385223445. The cubic root of 20173020 is about 272.2222628226. Note that the first 4 decimals are identical.

The spelling of 20173020 in words is "twenty million, one hundred seventy-three thousand, twenty".