20405250554425 has 24 divisors (see below), whose sum is σ = 27603195291360. Its totient is φ = 14839936867200.

The previous prime is 20405250554419. The next prime is 20405250554459. The reversal of 20405250554425 is 52445505250402.

It is not a de Polignac number, because 20405250554425 - 2³ = 20405250554417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16964341 + ... + 18127309.

It is an arithmetic number, because the mean of its divisors is an integer number (1150133137140).

Almost surely, 2^{20405250554425} is an apocalyptic number.

20405250554425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20405250554425 is a deficient number, since it is larger than the sum of its proper divisors (7197944736935).

20405250554425 is a wasteful number, since it uses less digits than its factorization.

20405250554425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226793 (or 1226788 counting only the distinct ones).

The product of its (nonzero) digits is 1600000, while the sum is 43.

The spelling of 20405250554425 in words is "twenty trillion, four hundred five billion, two hundred fifty million, five hundred fifty-four thousand, four hundred twenty-five".