20489679 has 20 divisors (see below), whose sum is σ = 34981584. Its totient is φ = 11708064.

The previous prime is 20489671. The next prime is 20489681. The reversal of 20489679 is 97698402.

It is a happy number.

It is not a de Polignac number, because 20489679 - 2³ = 20489671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489671) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17502 + ... + 18635.

Almost surely, 2^20489679 is an apocalyptic number.

20489679 is a deficient number, since it is larger than the sum of its proper divisors (14491905).

20489679 is an equidigital number, since it uses as much as digits as its factorization.

20489679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36156 (or 36147 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20489679 is about 4526.5526617946. The cubic root of 20489679 is about 273.6392458707.

The spelling of 20489679 in words is "twenty million, four hundred eighty-nine thousand, six hundred seventy-nine".