20700437639 has 12 divisors (see below), whose sum is σ = 24140173968. Its totient is φ = 17698968000.

The previous prime is 20700437633. The next prime is 20700437663. The reversal of 20700437639 is 93673400702.

It is not a de Polignac number, because 20700437639 - 2²⁴ = 20683660423 is a prime.

It is a super-2 number, since 2×20700437639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20700437596 and 20700437605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700437633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 507107 + ... + 546404.

It is an arithmetic number, because the mean of its divisors is an integer number (2011681164).

Almost surely, 2^20700437639 is an apocalyptic number.

20700437639 is a deficient number, since it is larger than the sum of its proper divisors (3439736329).

20700437639 is a wasteful number, since it uses less digits than its factorization.

20700437639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053926 (or 1053919 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 41.

The spelling of 20700437639 in words is "twenty billion, seven hundred million, four hundred thirty-seven thousand, six hundred thirty-nine".