20901959488 has 42 divisors (see below), whose sum is σ = 42612677538. Its totient is φ = 10165098240.

The previous prime is 20901959479. The next prime is 20901959497. The reversal of 20901959488 is 88495910902.

It is an interprime number because it is at equal distance from previous prime (20901959479) and next prime (20901959497).

It can be written as a sum of positive squares in only one way, i.e., 20337041664 + 564917824 = 142608^2 + 23768^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7033843 + ... + 7036813.

Almost surely, 2^20901959488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20901959488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21306338769).

20901959488 is an abundant number, since it is smaller than the sum of its proper divisors (21710718050).

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

20901959488 is an frugal number, since it uses more digits than its factorization.

20901959488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991 (or 3010 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 20901959488 in words is "twenty billion, nine hundred one million, nine hundred fifty-nine thousand, four hundred eighty-eight".