20529169680 has 80 divisors (see below), whose sum is σ = 65693366784. Its totient is φ = 5297848320.

The previous prime is 20529169657. The next prime is 20529169691. The reversal of 20529169680 is 8696192502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1372209 + ... + 1387088.

Almost surely, 2^20529169680 is an apocalyptic number.

20529169680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20529169680 is an abundant number, since it is smaller than the sum of its proper divisors (45164197104).

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

20529169680 is a wasteful number, since it uses less digits than its factorization.

20529169680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759344 (or 2759338 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 20529169680 in words is "twenty billion, five hundred twenty-nine million, one hundred sixty-nine thousand, six hundred eighty".