20625057505 has 16 divisors (see below), whose sum is σ = 26848486224. Its totient is φ = 15119631360.

The previous prime is 20625057473. The next prime is 20625057511. The reversal of 20625057505 is 50575052602.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1676984401 + 18948073104 = 40951^2 + 137652^2 .

It is not a de Polignac number, because 20625057505 - 2⁵ = 20625057473 is a prime.

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, 1149156 + ... + 1166965.

It is an arithmetic number, because the mean of its divisors is an integer number (1678030389).

Almost surely, 2^20625057505 is an apocalyptic number.

It is an amenable number.

20625057505 is a deficient number, since it is larger than the sum of its proper divisors (6223428719).

20625057505 is a wasteful number, since it uses less digits than its factorization.

20625057505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316276.

The product of its (nonzero) digits is 105000, while the sum is 37.

The spelling of 20625057505 in words is "twenty billion, six hundred twenty-five million, fifty-seven thousand, five hundred five".