20251069440 has 704 divisors, whose sum is σ = 81497456640. Its totient is φ = 4184801280.

The previous prime is 20251069439. The next prime is 20251069457. The reversal of 20251069440 is 4496015202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46986025 + ... + 46986455.

Almost surely, 2^20251069440 is an apocalyptic number.

20251069440 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 20251069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40748728320).

20251069440 is an abundant number, since it is smaller than the sum of its proper divisors (61246387200).

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

20251069440 is a wasteful number, since it uses less digits than its factorization.

20251069440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 20251069440 in words is "twenty billion, two hundred fifty-one million, sixty-nine thousand, four hundred forty".