20871729474 has 32 divisors (see below), whose sum is σ = 42106383360. Its totient is φ = 6896946000.

The previous prime is 20871729469. The next prime is 20871729499. The reversal of 20871729474 is 47492717802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421387 + ... + 468305.

It is an arithmetic number, because the mean of its divisors is an integer number (1315824480).

Almost surely, 2^20871729474 is an apocalyptic number.

20871729474 is an abundant number, since it is smaller than the sum of its proper divisors (21234653886).

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

20871729474 is a wasteful number, since it uses less digits than its factorization.

20871729474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47566.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 20871729474 in words is "twenty billion, eight hundred seventy-one million, seven hundred twenty-nine thousand, four hundred seventy-four".