20641262539 has 2 divisors, whose sum is σ = 20641262540. Its totient is φ = 20641262538.

The previous prime is 20641262501. The next prime is 20641262567. The reversal of 20641262539 is 93526214602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20641262539 - 2¹⁵ = 20641229771 is a prime.

It is not a weakly prime, because it can be changed into another prime (20641262339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320631269 + 10320631270.

It is an arithmetic number, because the mean of its divisors is an integer number (10320631270).

Almost surely, 2^20641262539 is an apocalyptic number.

20641262539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641262539 is an equidigital number, since it uses as much as digits as its factorization.

20641262539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 20641262539 in words is "twenty billion, six hundred forty-one million, two hundred sixty-two thousand, five hundred thirty-nine".