20620661520 has 40 divisors (see below), whose sum is σ = 63924051456. Its totient is φ = 5498843008.

The previous prime is 20620661519. The next prime is 20620661531. The reversal of 20620661520 is 2516602602.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 42959472 + ... + 42959951.

Almost surely, 2^20620661520 is an apocalyptic number.

20620661520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20620661520 is an abundant number, since it is smaller than the sum of its proper divisors (43303389936).

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

20620661520 is a wasteful number, since it uses less digits than its factorization.

20620661520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85919439 (or 85919433 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 20620661520 in words is "twenty billion, six hundred twenty million, six hundred sixty-one thousand, five hundred twenty".