20902922401 has 2 divisors, whose sum is σ = 20902922402. Its totient is φ = 20902922400.

The previous prime is 20902922357. The next prime is 20902922473. The reversal of 20902922401 is 10422920902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17193503376 + 3709419025 = 131124^2 + 60905^2 .

It is a cyclic number.

It is not a de Polignac number, because 20902922401 - 2⁹ = 20902921889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20902922501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451461200 + 10451461201.

It is an arithmetic number, because the mean of its divisors is an integer number (10451461201).

Almost surely, 2^20902922401 is an apocalyptic number.

It is an amenable number.

20902922401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20902922401 is an equidigital number, since it uses as much as digits as its factorization.

20902922401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 20902922401 in words is "twenty billion, nine hundred two million, nine hundred twenty-two thousand, four hundred one".