20696556 has 12 divisors (see below), whose sum is σ = 48291992. Its totient is φ = 6898848.

The previous prime is 20696549. The next prime is 20696581. The reversal of 20696556 is 65569602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20696556² = 856694860522272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862345 + ... + 862368.

Almost surely, 2^20696556 is an apocalyptic number.

It is an amenable number.

20696556 is an abundant number, since it is smaller than the sum of its proper divisors (27595436).

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

20696556 is a wasteful number, since it uses less digits than its factorization.

20696556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724720 (or 1724718 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 20696556 is about 4549.3467662951. The cubic root of 20696556 is about 274.5571096931.

The spelling of 20696556 in words is "twenty million, six hundred ninety-six thousand, five hundred fifty-six".