20919572507 has 2 divisors, whose sum is σ = 20919572508. Its totient is φ = 20919572506.

The previous prime is 20919572441. The next prime is 20919572519. The reversal of 20919572507 is 70527591902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20919572507 - 2²² = 20915378203 is a prime.

It is not a weakly prime, because it can be changed into another prime (20919572567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10459786253 + 10459786254.

It is an arithmetic number, because the mean of its divisors is an integer number (10459786254).

Almost surely, 2^20919572507 is an apocalyptic number.

20919572507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20919572507 is an equidigital number, since it uses as much as digits as its factorization.

20919572507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 47.

The spelling of 20919572507 in words is "twenty billion, nine hundred nineteen million, five hundred seventy-two thousand, five hundred seven".