20129366884 has 27 divisors (see below), whose sum is σ = 38725923481. Its totient is φ = 9148293440.

The previous prime is 20129366879. The next prime is 20129366909. The reversal of 20129366884 is 48866392102.

The square root of 20129366884 is 141878.

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

It can be written as a sum of positive squares in only one way, i.e., 19522237284 + 607129600 = 139722^2 + 24640^2 .

It is a super-2 number, since 2×20129366884² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3118092 + ... + 3124540.

Almost surely, 2^20129366884 is an apocalyptic number.

20129366884 is the 141878-th square number.

It is an amenable number.

20129366884 is a deficient number, since it is larger than the sum of its proper divisors (18596556597).

20129366884 is an frugal number, since it uses more digits than its factorization.

20129366884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12924 (or 6462 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

Multiplying 20129366884 by its sum of digits (49), we get a square (986338977316 = 993146²).

The spelling of 20129366884 in words is "twenty billion, one hundred twenty-nine million, three hundred sixty-six thousand, eight hundred eighty-four".