20637247008 has 144 divisors (see below), whose sum is σ = 63462087360. Its totient is φ = 5752227840.

The previous prime is 20637246997. The next prime is 20637247027. The reversal of 20637247008 is 80074273602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1120498 + ... + 1138766.

It is an arithmetic number, because the mean of its divisors is an integer number (440708940).

Almost surely, 2^20637247008 is an apocalyptic number.

20637247008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20637247008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31731043680).

20637247008 is an abundant number, since it is smaller than the sum of its proper divisors (42824840352).

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

20637247008 is a wasteful number, since it uses less digits than its factorization.

20637247008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18371 (or 18322 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 20637247008 in words is "twenty billion, six hundred thirty-seven million, two hundred forty-seven thousand, eight".