20251581400 has 24 divisors (see below), whose sum is σ = 47084927220. Its totient is φ = 8100632480.

The previous prime is 20251581367. The next prime is 20251581401. The reversal of 20251581400 is 418515202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251581401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50628754 + ... + 50629153.

Almost surely, 2^20251581400 is an apocalyptic number.

20251581400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20251581400 is an abundant number, since it is smaller than the sum of its proper divisors (26833345820).

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

20251581400 is a wasteful number, since it uses less digits than its factorization.

20251581400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101257923 (or 101257914 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The spelling of 20251581400 in words is "twenty billion, two hundred fifty-one million, five hundred eighty-one thousand, four hundred".