20242989 has 18 divisors (see below), whose sum is σ = 31664490. Its totient is φ = 12456288.

The previous prime is 20242951. The next prime is 20242993. The reversal of 20242989 is 98924202.

It can be written as a sum of positive squares in 3 ways, for example, as 2350089 + 17892900 = 1533^2 + 4230^2 .

It is not a de Polignac number, because 20242989 - 2⁷ = 20242861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20242949) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5134 + ... + 8175.

Almost surely, 2^20242989 is an apocalyptic number.

It is an amenable number.

20242989 is a deficient number, since it is larger than the sum of its proper divisors (11421501).

20242989 is a wasteful number, since it uses less digits than its factorization.

20242989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13341 (or 13325 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20242989 is about 4499.2209325615. The cubic root of 20242989 is about 272.5366289173.

The spelling of 20242989 in words is "twenty million, two hundred forty-two thousand, nine hundred eighty-nine".