20919462901 has 2 divisors, whose sum is σ = 20919462902. Its totient is φ = 20919462900.

The previous prime is 20919462779. The next prime is 20919462917. The reversal of 20919462901 is 10926491902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15789179025 + 5130283876 = 125655^2 + 71626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20919462901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20919462101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10459731450 + 10459731451.

It is an arithmetic number, because the mean of its divisors is an integer number (10459731451).

Almost surely, 2^20919462901 is an apocalyptic number.

It is an amenable number.

20919462901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20919462901 is an equidigital number, since it uses as much as digits as its factorization.

20919462901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 20919462901 in words is "twenty billion, nine hundred nineteen million, four hundred sixty-two thousand, nine hundred one".