20530937639 has 4 divisors (see below), whose sum is σ = 20544526800. Its totient is φ = 20517348480.

The previous prime is 20530937629. The next prime is 20530937671. The reversal of 20530937639 is 93673903502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20530937639 - 2¹² = 20530933543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20530937593 and 20530937602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530937629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6792314 + ... + 6795335.

It is an arithmetic number, because the mean of its divisors is an integer number (5136131700).

Almost surely, 2^20530937639 is an apocalyptic number.

20530937639 is a deficient number, since it is larger than the sum of its proper divisors (13589161).

20530937639 is a wasteful number, since it uses less digits than its factorization.

20530937639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13589160.

The product of its (nonzero) digits is 918540, while the sum is 47.

The spelling of 20530937639 in words is "twenty billion, five hundred thirty million, nine hundred thirty-seven thousand, six hundred thirty-nine".