20720171496 has 32 divisors (see below), whose sum is σ = 52777798560. Its totient is φ = 6776407872.

The previous prime is 20720171477. The next prime is 20720171501. The reversal of 20720171496 is 69417102702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8143450 + ... + 8145993.

It is an arithmetic number, because the mean of its divisors is an integer number (1649306205).

Almost surely, 2^20720171496 is an apocalyptic number.

It is an amenable number.

20720171496 is an abundant number, since it is smaller than the sum of its proper divisors (32057627064).

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

20720171496 is a wasteful number, since it uses less digits than its factorization.

20720171496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16289505 (or 16289501 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The spelling of 20720171496 in words is "twenty billion, seven hundred twenty million, one hundred seventy-one thousand, four hundred ninety-six".