20591955384 has 512 divisors, whose sum is σ = 73156608000. Its totient is φ = 4655185920.

The previous prime is 20591955341. The next prime is 20591955401. The reversal of 20591955384 is 48355919502.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 45861592 + ... + 45862040.

It is an arithmetic number, because the mean of its divisors is an integer number (142884000).

Almost surely, 2^20591955384 is an apocalyptic number.

20591955384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20591955384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36578304000).

20591955384 is an abundant number, since it is smaller than the sum of its proper divisors (52564652616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20591955384 is a wasteful number, since it uses less digits than its factorization.

20591955384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 20591955384 in words is "twenty billion, five hundred ninety-one million, nine hundred fifty-five thousand, three hundred eighty-four".