20756643774 has 16 divisors (see below), whose sum is σ = 42852426240. Its totient is φ = 6695691480.

The previous prime is 20756643763. The next prime is 20756643781. The reversal of 20756643774 is 47734665702.

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, 55797244 + ... + 55797615.

It is an arithmetic number, because the mean of its divisors is an integer number (2678276640).

Almost surely, 2^20756643774 is an apocalyptic number.

20756643774 is an abundant number, since it is smaller than the sum of its proper divisors (22095782466).

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

20756643774 is a wasteful number, since it uses less digits than its factorization.

20756643774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111594895.

The product of its (nonzero) digits is 5927040, while the sum is 51.

The spelling of 20756643774 in words is "twenty billion, seven hundred fifty-six million, six hundred forty-three thousand, seven hundred seventy-four".