20257255921920 has 144 divisors (see below), whose sum is σ = 64701491890560. Its totient is φ = 5401527386112.

The previous prime is 20257255921867. The next prime is 20257255921933. The reversal of 20257255921920 is 2912955275202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52527237 + ... + 52911483.

Almost surely, 2^{20257255921920} is an apocalyptic number.

20257255921920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20257255921920 is an abundant number, since it is smaller than the sum of its proper divisors (44444235968640).

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

20257255921920 is a wasteful number, since it uses less digits than its factorization.

20257255921920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398000 (or 397986 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 20257255921920 in words is "twenty trillion, two hundred fifty-seven billion, two hundred fifty-five million, nine hundred twenty-one thousand, nine hundred twenty".