20251844920 has 192 divisors, whose sum is σ = 50125845600. Its totient is φ = 7349529600.

The previous prime is 20251844903. The next prime is 20251844933. The reversal of 20251844920 is 2944815202.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 20251844920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41245875 + ... + 41246365.

Almost surely, 2^20251844920 is an apocalyptic number.

20251844920 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 20251844920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25062922800).

20251844920 is an abundant number, since it is smaller than the sum of its proper divisors (29874000680).

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

20251844920 is a wasteful number, since it uses less digits than its factorization.

20251844920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 20251844920 in words is "twenty billion, two hundred fifty-one million, eight hundred forty-four thousand, nine hundred twenty".