20147237664 has 48 divisors (see below), whose sum is σ = 52902162432. Its totient is φ = 6713756928.

The previous prime is 20147237641. The next prime is 20147237699. The reversal of 20147237664 is 46673274102.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×20147237664² (a number of 21 digits) contains 22 as substring.

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, 314682 + ... + 373254.

It is an arithmetic number, because the mean of its divisors is an integer number (1102128384).

Almost surely, 2^20147237664 is an apocalyptic number.

20147237664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20147237664 is an abundant number, since it is smaller than the sum of its proper divisors (32754924768).

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

20147237664 is a wasteful number, since it uses less digits than its factorization.

20147237664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62169 (or 62161 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 42.

The spelling of 20147237664 in words is "twenty billion, one hundred forty-seven million, two hundred thirty-seven thousand, six hundred sixty-four".