20312154315225 has 60 divisors (see below), whose sum is σ = 37631226033324. Its totient is φ = 10831394148480.

The previous prime is 20312154315217. The next prime is 20312154315247. The reversal of 20312154315225 is 52251345121302.

20312154315225 is a `hidden beast` number, since 2 + 0 + 3 + 1 + 215 + 431 + 5 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 922037811984 + 19390116503241 = 960228^2 + 4403421^2 .

It is not a de Polignac number, because 20312154315225 - 2³ = 20312154315217 is a prime.

It is a super-2 number, since 2×20312154315225² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20312154315225.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 11739607 + ... + 13358243.

Almost surely, 2^{20312154315225} is an apocalyptic number.

20312154315225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20312154315225 is a deficient number, since it is larger than the sum of its proper divisors (17319071718099).

20312154315225 is a wasteful number, since it uses less digits than its factorization.

20312154315225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624856 (or 1624842 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 20312154315225 its reverse (52251345121302), we get a palindrome (72563499436527).

The spelling of 20312154315225 in words is "twenty trillion, three hundred twelve billion, one hundred fifty-four million, three hundred fifteen thousand, two hundred twenty-five".