20871729498 has 32 divisors (see below), whose sum is σ = 44210059200. Its totient is φ = 6546348800.

The previous prime is 20871729469. The next prime is 20871729499. The reversal of 20871729498 is 89492717802.

It is not an unprimeable number, because it can be changed into a prime (20871729499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420073 + ... + 467123.

It is an arithmetic number, because the mean of its divisors is an integer number (1381564350).

Almost surely, 2^20871729498 is an apocalyptic number.

20871729498 is an abundant number, since it is smaller than the sum of its proper divisors (23338329702).

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

20871729498 is a wasteful number, since it uses less digits than its factorization.

20871729498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51422.

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 20871729498 in words is "twenty billion, eight hundred seventy-one million, seven hundred twenty-nine thousand, four hundred ninety-eight".