20013721567425 has 72 divisors (see below), whose sum is σ = 36851796130968. Its totient is φ = 10376583168000.

The previous prime is 20013721567409. The next prime is 20013721567517. The reversal of 20013721567425 is 52476512731002.

20013721567425 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 3 + 7 + 215 + 6 + 7 + 425 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 15423873800976 + 4589847766449 = 3927324^2 + 2142393^2 .

It is not a de Polignac number, because 20013721567425 - 2⁴ = 20013721567409 is a prime.

It is a super-2 number, since 2×20013721567425² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1268112 + ... + 6452561.

It is an arithmetic number, because the mean of its divisors is an integer number (511830501819).

Almost surely, 2^{20013721567425} is an apocalyptic number.

20013721567425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20013721567425 is a deficient number, since it is larger than the sum of its proper divisors (16838074563543).

20013721567425 is a wasteful number, since it uses less digits than its factorization.

20013721567425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7721011 (or 7721003 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 20013721567425 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, five hundred sixty-seven thousand, four hundred twenty-five".