20513384825 has 6 divisors (see below), whose sum is σ = 25436597214. Its totient is φ = 16410707840.

The previous prime is 20513384803. The next prime is 20513384833. The reversal of 20513384825 is 52848331502.

It can be written as a sum of positive squares in 3 ways, for example, as 1461379984 + 19052004841 = 38228^2 + 138029^2 .

It is not a de Polignac number, because 20513384825 - 2¹⁴ = 20513368441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410267672 + ... + 410267721.

It is an arithmetic number, because the mean of its divisors is an integer number (4239432869).

Almost surely, 2^20513384825 is an apocalyptic number.

20513384825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20513384825 is a deficient number, since it is larger than the sum of its proper divisors (4923212389).

20513384825 is an equidigital number, since it uses as much as digits as its factorization.

20513384825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820535403 (or 820535398 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 20513384825 in words is "twenty billion, five hundred thirteen million, three hundred eighty-four thousand, eight hundred twenty-five".