20280788 has 24 divisors (see below), whose sum is σ = 39070080. Its totient is φ = 9134720.

The previous prime is 20280781. The next prime is 20280791. The reversal of 20280788 is 88708202.

It is a super-2 number, since 2×20280788² = 822620723801888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280781) 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, 2933 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^20280788 is an apocalyptic number.

It is an amenable number.

20280788 is a deficient number, since it is larger than the sum of its proper divisors (18789292).

20280788 is a wasteful number, since it uses less digits than its factorization.

20280788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207 (or 4205 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 20280788 is about 4503.4195896008. The cubic root of 20280788 is about 272.7061560351.

The spelling of 20280788 in words is "twenty million, two hundred eighty thousand, seven hundred eighty-eight".