20356633640531 has 2 divisors, whose sum is σ = 20356633640532. Its totient is φ = 20356633640530.

The previous prime is 20356633640521. The next prime is 20356633640537. The reversal of 20356633640531 is 13504633665302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20356633640531 - 2⁶ = 20356633640467 is a prime.

It is a super-2 number, since 2×20356633640531² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20356633640537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178316820265 + 10178316820266.

It is an arithmetic number, because the mean of its divisors is an integer number (10178316820266).

Almost surely, 2^{20356633640531} is an apocalyptic number.

20356633640531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356633640531 is an equidigital number, since it uses as much as digits as its factorization.

20356633640531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 47.

The spelling of 20356633640531 in words is "twenty trillion, three hundred fifty-six billion, six hundred thirty-three million, six hundred forty thousand, five hundred thirty-one".