20296989 has 24 divisors (see below), whose sum is σ = 30270240. Its totient is φ = 13097952.

The previous prime is 20296987. The next prime is 20297027. The reversal of 20296989 is 98969202.

It is not a de Polignac number, because 20296989 - 2¹ = 20296987 is a prime.

It is a super-2 number, since 2×20296989² = 823935524932242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20296981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69127 + ... + 69419.

It is an arithmetic number, because the mean of its divisors is an integer number (1261260).

Almost surely, 2^20296989 is an apocalyptic number.

It is an amenable number.

20296989 is a deficient number, since it is larger than the sum of its proper divisors (9973251).

20296989 is a wasteful number, since it uses less digits than its factorization.

20296989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20296989 is about 4505.2179747488. The cubic root of 20296989 is about 272.7787524336.

The spelling of 20296989 in words is "twenty million, two hundred ninety-six thousand, nine hundred eighty-nine".