20871729475 has 12 divisors (see below), whose sum is σ = 25882779904. Its totient is φ = 16696199520.

The previous prime is 20871729469. The next prime is 20871729499. The reversal of 20871729475 is 57492717802.

It is not a de Polignac number, because 20871729475 - 2²³ = 20863340867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 561157 + ... + 597193.

Almost surely, 2^20871729475 is an apocalyptic number.

20871729475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20871729475 is a deficient number, since it is larger than the sum of its proper divisors (5011050429).

20871729475 is a wasteful number, since it uses less digits than its factorization.

20871729475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59214 (or 59209 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 20871729475 in words is "twenty billion, eight hundred seventy-one million, seven hundred twenty-nine thousand, four hundred seventy-five".