20558044920 has 512 divisors, whose sum is σ = 79412244480. Its totient is φ = 4146954240.

The previous prime is 20558044919. The next prime is 20558044921. The reversal of 20558044920 is 2944085502.

It is an interprime number because it is at equal distance from previous prime (20558044919) and next prime (20558044921).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20558044921) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17406730 + ... + 17407910.

It is an arithmetic number, because the mean of its divisors is an integer number (155102040).

Almost surely, 2^20558044920 is an apocalyptic number.

20558044920 is a gapful number since it is divisible by the number (20) 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 20558044920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39706122240).

20558044920 is an abundant number, since it is smaller than the sum of its proper divisors (58854199560).

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

20558044920 is a wasteful number, since it uses less digits than its factorization.

20558044920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 20558044920 in words is "twenty billion, five hundred fifty-eight million, forty-four thousand, nine hundred twenty".