20670139225 has 12 divisors (see below), whose sum is σ = 25642623276. Its totient is φ = 16528594880.

The previous prime is 20670139223. The next prime is 20670139229. The reversal of 20670139225 is 52293107602.

It can be written as a sum of positive squares in 6 ways, for example, as 824091849 + 19846047376 = 28707^2 + 140876^2 .

It is not a de Polignac number, because 20670139225 - 2¹ = 20670139223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20670139223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131482 + ... + 242131.

It is an arithmetic number, because the mean of its divisors is an integer number (2136885273).

Almost surely, 2^20670139225 is an apocalyptic number.

20670139225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20670139225 is a deficient number, since it is larger than the sum of its proper divisors (4972484051).

20670139225 is a wasteful number, since it uses less digits than its factorization.

20670139225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375836 (or 375831 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

It can be divided in two parts, 20670 and 139225, that added together give a triangular number (159895 = T₅₆₅).

The spelling of 20670139225 in words is "twenty billion, six hundred seventy million, one hundred thirty-nine thousand, two hundred twenty-five".