20620535556 has 12 divisors (see below), whose sum is σ = 48114582992. Its totient is φ = 6873511848.

The previous prime is 20620535549. The next prime is 20620535563. The reversal of 20620535556 is 65553502602.

It is an interprime number because it is at equal distance from previous prime (20620535549) and next prime (20620535563).

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

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, 859188970 + ... + 859188993.

Almost surely, 2^20620535556 is an apocalyptic number.

It is an amenable number.

20620535556 is an abundant number, since it is smaller than the sum of its proper divisors (27494047436).

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

20620535556 is a wasteful number, since it uses less digits than its factorization.

20620535556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718377970 (or 1718377968 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 20620535556 in words is "twenty billion, six hundred twenty million, five hundred thirty-five thousand, five hundred fifty-six".