20855880437 has 12 divisors (see below), whose sum is σ = 24451960320. Its totient is φ = 17735704056.

The previous prime is 20855880433. The next prime is 20855880467. The reversal of 20855880437 is 73408855802.

It is a happy number.

It is not a de Polignac number, because 20855880437 - 2² = 20855880433 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855880433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1669487 + ... + 1681932.

It is an arithmetic number, because the mean of its divisors is an integer number (2037663360).

Almost surely, 2^20855880437 is an apocalyptic number.

It is an amenable number.

20855880437 is a deficient number, since it is larger than the sum of its proper divisors (3596079883).

20855880437 is a wasteful number, since it uses less digits than its factorization.

20855880437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351560 (or 3351553 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 20855880437 in words is "twenty billion, eight hundred fifty-five million, eight hundred eighty thousand, four hundred thirty-seven".