20769997924 has 81 divisors (see below), whose sum is σ = 41315604939. Its totient is φ = 9131316480.

The previous prime is 20769997921. The next prime is 20769997943. The reversal of 20769997924 is 42979996702.

The square root of 20769997924 is 144118.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 330148900 + 20439849024 = 18170^2 + 142968^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20769997921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 86182444 + ... + 86182684.

Almost surely, 2^20769997924 is an apocalyptic number.

20769997924 is the 144118-th square number.

It is an amenable number.

20769997924 is a deficient number, since it is larger than the sum of its proper divisors (20545607015).

20769997924 is a wasteful number, since it uses less digits than its factorization.

20769997924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 64.

Multiplying 20769997924 by its sum of digits (64), we get a square (1329279867136 = 1152944²).

It can be divided in two parts, 2076 and 9997924, that added together give a 7-th power (10000000 = 10⁷).

The spelling of 20769997924 in words is "twenty billion, seven hundred sixty-nine million, nine hundred ninety-seven thousand, nine hundred twenty-four".