20955529398639 has 16 divisors (see below), whose sum is σ = 30667768631424. Its totient is φ = 12622404765600.

The previous prime is 20955529398631. The next prime is 20955529398647. The reversal of 20955529398639 is 93689392555902.

It is an interprime number because it is at equal distance from previous prime (20955529398631) and next prime (20955529398647).

It is not a de Polignac number, because 20955529398639 - 2³ = 20955529398631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955529398631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1947896592 + ... + 1947907349.

It is an arithmetic number, because the mean of its divisors is an integer number (1916735539464).

Almost surely, 2^{20955529398639} is an apocalyptic number.

20955529398639 is a deficient number, since it is larger than the sum of its proper divisors (9712239232785).

20955529398639 is a wasteful number, since it uses less digits than its factorization.

20955529398639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895804118.

The product of its (nonzero) digits is 1417176000, while the sum is 75.

The spelling of 20955529398639 in words is "twenty trillion, nine hundred fifty-five billion, five hundred twenty-nine million, three hundred ninety-eight thousand, six hundred thirty-nine".