20497240499 has 2 divisors, whose sum is σ = 20497240500. Its totient is φ = 20497240498.

The previous prime is 20497240471. The next prime is 20497240537. The reversal of 20497240499 is 99404279402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20497240499 - 2²⁰ = 20496191923 is a prime.

It is not a weakly prime, because it can be changed into another prime (20497240409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10248620249 + 10248620250.

It is an arithmetic number, because the mean of its divisors is an integer number (10248620250).

Almost surely, 2^20497240499 is an apocalyptic number.

20497240499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20497240499 is an equidigital number, since it uses as much as digits as its factorization.

20497240499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 20497240499 in words is "twenty billion, four hundred ninety-seven million, two hundred forty thousand, four hundred ninety-nine".