20437619536 has 10 divisors (see below), whose sum is σ = 39597887882. Its totient is φ = 10218809760.

The previous prime is 20437619513. The next prime is 20437619537. The reversal of 20437619536 is 63591673402.

It can be written as a sum of positive squares in only one way, i.e., 12711209536 + 7726410000 = 112744^2 + 87900^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20437619537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638675595 + ... + 638675626.

Almost surely, 2^20437619536 is an apocalyptic number.

It is an amenable number.

20437619536 is a deficient number, since it is larger than the sum of its proper divisors (19160268346).

20437619536 is a wasteful number, since it uses less digits than its factorization.

20437619536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277351229 (or 1277351223 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 20437619536 in words is "twenty billion, four hundred thirty-seven million, six hundred nineteen thousand, five hundred thirty-six".