20620356464497 has 2 divisors, whose sum is σ = 20620356464498. Its totient is φ = 20620356464496.

The previous prime is 20620356464489. The next prime is 20620356464597. The reversal of 20620356464497 is 79446465302602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20561227733601 + 59128730896 = 4534449^2 + 243164^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620356464497 - 2³ = 20620356464489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20620356464597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310178232248 + 10310178232249.

It is an arithmetic number, because the mean of its divisors is an integer number (10310178232249).

Almost surely, 2^{20620356464497} is an apocalyptic number.

It is an amenable number.

20620356464497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620356464497 is an equidigital number, since it uses as much as digits as its factorization.

20620356464497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 58.

The spelling of 20620356464497 in words is "twenty trillion, six hundred twenty billion, three hundred fifty-six million, four hundred sixty-four thousand, four hundred ninety-seven".