20259816 has 32 divisors (see below), whose sum is σ = 50880960. Its totient is φ = 6722432.

The previous prime is 20259809. The next prime is 20259823. The reversal of 20259816 is 61895202.

It is an interprime number because it is at equal distance from previous prime (20259809) and next prime (20259823).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3781 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (1590030).

Almost surely, 2^20259816 is an apocalyptic number.

It is an amenable number.

20259816 is an abundant number, since it is smaller than the sum of its proper divisors (30621144).

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

20259816 is a wasteful number, since it uses less digits than its factorization.

20259816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865 (or 3861 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20259816 is about 4501.0905345260. The cubic root of 20259816 is about 272.6121234296.

The spelling of 20259816 in words is "twenty million, two hundred fifty-nine thousand, eight hundred sixteen".