20484561920 has 88 divisors (see below), whose sum is σ = 50724463488. Its totient is φ = 7929446400.

The previous prime is 20484561907. The next prime is 20484561931. The reversal of 20484561920 is 2916548402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94190 + ... + 223250.

Almost surely, 2^20484561920 is an apocalyptic number.

20484561920 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 20484561920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25362231744).

20484561920 is an abundant number, since it is smaller than the sum of its proper divisors (30239901568).

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

20484561920 is a wasteful number, since it uses less digits than its factorization.

20484561920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129117 (or 129099 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 20484561920 in words is "twenty billion, four hundred eighty-four million, five hundred sixty-one thousand, nine hundred twenty".