20415690 has 48 divisors (see below), whose sum is σ = 55879200. Its totient is φ = 5157216.

The previous prime is 20415677. The next prime is 20415713. The reversal of 20415690 is 9651402.

It is a super-2 number, since 2×20415690² = 833600796352200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4260 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (1164150).

Almost surely, 2^20415690 is an apocalyptic number.

20415690 is an abundant number, since it is smaller than the sum of its proper divisors (35463510).

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

20415690 is a wasteful number, since it uses less digits than its factorization.

20415690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11971 (or 11968 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20415690 is about 4518.3724946047. The cubic root of 20415690 is about 273.3094747501.

The spelling of 20415690 in words is "twenty million, four hundred fifteen thousand, six hundred ninety".