20653916 has 24 divisors (see below), whose sum is σ = 37588320. Its totient is φ = 9918272.

The previous prime is 20653909. The next prime is 20653921. The reversal of 20653916 is 61935602.

It is a happy number.

It is a super-2 number, since 2×20653916² = 853168492270112, which contains 22 as substring.

It is a congruent number.

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, 30170 + ... + 30846.

It is an arithmetic number, because the mean of its divisors is an integer number (1566180).

Almost surely, 2^20653916 is an apocalyptic number.

It is an amenable number.

20653916 is a deficient number, since it is larger than the sum of its proper divisors (16934404).

20653916 is a wasteful number, since it uses less digits than its factorization.

20653916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20653916 is about 4544.6579629275. The cubic root of 20653916 is about 274.3684283135.

The spelling of 20653916 in words is "twenty million, six hundred fifty-three thousand, nine hundred sixteen".