20970899 has 2 divisors, whose sum is σ = 20970900. Its totient is φ = 20970898.

The previous prime is 20970893. The next prime is 20970919. The reversal of 20970899 is 99807902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20970899 - 2⁸ = 20970643 is a prime.

It is not a weakly prime, because it can be changed into another prime (20970893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10485449 + 10485450.

It is an arithmetic number, because the mean of its divisors is an integer number (10485450).

Almost surely, 2^20970899 is an apocalyptic number.

20970899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20970899 is an equidigital number, since it uses as much as digits as its factorization.

20970899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 20970899 is about 4579.3994147705. The cubic root of 20970899 is about 275.7649183247.

The spelling of 20970899 in words is "twenty million, nine hundred seventy thousand, eight hundred ninety-nine".