20900489 has 2 divisors, whose sum is σ = 20900490. Its totient is φ = 20900488.

The previous prime is 20900471. The next prime is 20900527. The reversal of 20900489 is 98400902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12020089 + 8880400 = 3467^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20900489 - 2¹⁶ = 20834953 is a prime.

It is not a weakly prime, because it can be changed into another prime (20900459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10450244 + 10450245.

It is an arithmetic number, because the mean of its divisors is an integer number (10450245).

Almost surely, 2^20900489 is an apocalyptic number.

It is an amenable number.

20900489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20900489 is an equidigital number, since it uses as much as digits as its factorization.

20900489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20900489 is about 4571.7052617158. The cubic root of 20900489 is about 275.4559444619.

The spelling of 20900489 in words is "twenty million, nine hundred thousand, four hundred eighty-nine".