20662947401 has 2 divisors, whose sum is σ = 20662947402. Its totient is φ = 20662947400.

The previous prime is 20662947379. The next prime is 20662947451. The reversal of 20662947401 is 10474926602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18856782400 + 1806165001 = 137320^2 + 42499^2 .

It is a cyclic number.

It is not a de Polignac number, because 20662947401 - 2²⁶ = 20595838537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20662947451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331473700 + 10331473701.

It is an arithmetic number, because the mean of its divisors is an integer number (10331473701).

Almost surely, 2^20662947401 is an apocalyptic number.

It is an amenable number.

20662947401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662947401 is an equidigital number, since it uses as much as digits as its factorization.

20662947401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 20662947401 in words is "twenty billion, six hundred sixty-two million, nine hundred forty-seven thousand, four hundred one".