20637493470 has 160 divisors (see below), whose sum is σ = 61367850720. Its totient is φ = 4934338560.

The previous prime is 20637493469. The next prime is 20637493483. The reversal of 20637493470 is 7439473602.

20637493470 = 8261² + 8262² + ... + 8552².

20637493470 is a `hidden beast` number, since 2 + 0 + 637 + 4 + 9 + 3 + 4 + 7 + 0 = 666.

It is a super-2 number, since 2×20637493470² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 634566 + ... + 666294.

It is an arithmetic number, because the mean of its divisors is an integer number (383549067).

Almost surely, 2^20637493470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20637493470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30683925360).

20637493470 is an abundant number, since it is smaller than the sum of its proper divisors (40730357250).

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

20637493470 is a wasteful number, since it uses less digits than its factorization.

20637493470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31832 (or 31823 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The spelling of 20637493470 in words is "twenty billion, six hundred thirty-seven million, four hundred ninety-three thousand, four hundred seventy".