20802056751 has 24 divisors (see below), whose sum is σ = 34379150624. Its totient is φ = 11873304000.

The previous prime is 20802056711. The next prime is 20802056771. The reversal of 20802056751 is 15765020802.

It is a happy number.

20802056751 is a `hidden beast` number, since 20 + 8 + 0 + 20 + 567 + 51 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20802056751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802056711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133000 + ... + 243501.

Almost surely, 2^20802056751 is an apocalyptic number.

20802056751 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20802056751 is a deficient number, since it is larger than the sum of its proper divisors (13577093873).

20802056751 is a wasteful number, since it uses less digits than its factorization.

20802056751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377391 (or 377388 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 20802056751 in words is "twenty billion, eight hundred two million, fifty-six thousand, seven hundred fifty-one".