20634471564 has 96 divisors (see below), whose sum is σ = 55314040320. Its totient is φ = 5864721408.

The previous prime is 20634471499. The next prime is 20634471569. The reversal of 20634471564 is 46517443602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20634471569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18878202 + ... + 18879294.

It is an arithmetic number, because the mean of its divisors is an integer number (576187920).

Almost surely, 2^20634471564 is an apocalyptic number.

It is an amenable number.

20634471564 is an abundant number, since it is smaller than the sum of its proper divisors (34679568756).

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

20634471564 is a wasteful number, since it uses less digits than its factorization.

20634471564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079 (or 2077 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 20634471564 in words is "twenty billion, six hundred thirty-four million, four hundred seventy-one thousand, five hundred sixty-four".