20365020 has 120 divisors (see below), whose sum is σ = 68871264. Its totient is φ = 5007744.

The previous prime is 20365019. The next prime is 20365027. The reversal of 20365020 is 2056302.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20364984 and 20365002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20365027) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20577 + ... + 21543.

Almost surely, 2^20365020 is an apocalyptic number.

20365020 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 20365020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34435632).

20365020 is an abundant number, since it is smaller than the sum of its proper divisors (48506244).

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

20365020 is a wasteful number, since it uses less digits than its factorization.

20365020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20365020 is about 4512.7619037569. The cubic root of 20365020 is about 273.0831771669.

It can be divided in two parts, 2036 and 5020, that added together give a square (7056 = 84²).

The spelling of 20365020 in words is "twenty million, three hundred sixty-five thousand, twenty".