20606056501 has 2 divisors, whose sum is σ = 20606056502. Its totient is φ = 20606056500.

The previous prime is 20606056487. The next prime is 20606056511. The reversal of 20606056501 is 10565060602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13239954225 + 7366102276 = 115065^2 + 85826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20606056501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20606056511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10303028250 + 10303028251.

It is an arithmetic number, because the mean of its divisors is an integer number (10303028251).

Almost surely, 2^20606056501 is an apocalyptic number.

It is an amenable number.

20606056501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20606056501 is an equidigital number, since it uses as much as digits as its factorization.

20606056501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20606056501 in words is "twenty billion, six hundred six million, fifty-six thousand, five hundred one".