20901499 has 2 divisors, whose sum is σ = 20901500. Its totient is φ = 20901498.

The previous prime is 20901473. The next prime is 20901509. The reversal of 20901499 is 99410902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20901499 - 2⁷ = 20901371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20901469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10450749 + 10450750.

It is an arithmetic number, because the mean of its divisors is an integer number (10450750).

Almost surely, 2^20901499 is an apocalyptic number.

20901499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20901499 is an equidigital number, since it uses as much as digits as its factorization.

20901499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 20901499 is about 4571.8157224455. The cubic root of 20901499 is about 275.4603814558.

The spelling of 20901499 in words is "twenty million, nine hundred one thousand, four hundred ninety-nine".