20425621244 has 96 divisors (see below), whose sum is σ = 44399456640. Its totient is φ = 8021606400.

The previous prime is 20425621213. The next prime is 20425621253. The reversal of 20425621244 is 44212652402.

It is a self number, because there is not a number n which added to its sum of digits gives 20425621244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15007124 + ... + 15008484.

It is an arithmetic number, because the mean of its divisors is an integer number (462494340).

Almost surely, 2^20425621244 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 20425621244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22199728320).

20425621244 is an abundant number, since it is smaller than the sum of its proper divisors (23973835396).

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

20425621244 is a wasteful number, since it uses less digits than its factorization.

20425621244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199 (or 2197 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

The spelling of 20425621244 in words is "twenty billion, four hundred twenty-five million, six hundred twenty-one thousand, two hundred forty-four".