20775002520 has 32 divisors (see below), whose sum is σ = 62325007920. Its totient is φ = 5540000640.

The previous prime is 20775002509. The next prime is 20775002531. The reversal of 20775002520 is 2520057702.

It is an interprime number because it is at equal distance from previous prime (20775002509) and next prime (20775002531).

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

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, 86562391 + ... + 86562630.

Almost surely, 2^20775002520 is an apocalyptic number.

20775002520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20775002520 is an abundant number, since it is smaller than the sum of its proper divisors (41550005400).

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

20775002520 is a wasteful number, since it uses less digits than its factorization.

20775002520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173125035 (or 173125031 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The spelling of 20775002520 in words is "twenty billion, seven hundred seventy-five million, two thousand, five hundred twenty".