20925020 has 24 divisors (see below), whose sum is σ = 44109744. Its totient is φ = 8338176.

The previous prime is 20925019. The next prime is 20925029. The reversal of 20925020 is 2052902.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20924983 and 20925001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20925029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3812 + ... + 7508.

It is an arithmetic number, because the mean of its divisors is an integer number (1837906).

Almost surely, 2^20925020 is an apocalyptic number.

20925020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20925020 is an abundant number, since it is smaller than the sum of its proper divisors (23184724).

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

20925020 is a wasteful number, since it uses less digits than its factorization.

20925020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989 (or 3987 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20925020 is about 4574.3873906787. The cubic root of 20925020 is about 275.5636702962.

Adding to 20925020 its reverse (2052902), we get a palindrome (22977922).

The spelling of 20925020 in words is "twenty million, nine hundred twenty-five thousand, twenty".