20407630356 has 18 divisors (see below), whose sum is σ = 51585954602. Its totient is φ = 6802543440.

The previous prime is 20407630289. The next prime is 20407630379. The reversal of 20407630356 is 65303670402.

20407630356 is a `hidden beast` number, since 204 + 0 + 76 + 30 + 356 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18403635600 + 2003994756 = 135660^2 + 44766^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 566878621 = 20407630356 / (2 + 0 + 4 + 0 + 7 + 6 + 3 + 0 + 3 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 20407630356.

It is a congruent 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, 283439275 + ... + 283439346.

Almost surely, 2^20407630356 is an apocalyptic number.

It is an amenable number.

20407630356 is an abundant number, since it is smaller than the sum of its proper divisors (31178324246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20407630356 is a wasteful number, since it uses less digits than its factorization.

20407630356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566878631 (or 566878626 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

It can be divided in two parts, 204076 and 30356, that added together give a palindrome (234432).

The spelling of 20407630356 in words is "twenty billion, four hundred seven million, six hundred thirty thousand, three hundred fifty-six".