20692489 has 4 divisors (see below), whose sum is σ = 20715156. Its totient is φ = 20669824.

The previous prime is 20692487. The next prime is 20692493. The reversal of 20692489 is 98429602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6943225 + 13749264 = 2635^2 + 3708^2 .

It is a cyclic number.

It is not a de Polignac number, because 20692489 - 2¹ = 20692487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20692487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9904 + ... + 11809.

It is an arithmetic number, because the mean of its divisors is an integer number (5178789).

Almost surely, 2^20692489 is an apocalyptic number.

It is an amenable number.

20692489 is a deficient number, since it is larger than the sum of its proper divisors (22667).

20692489 is an equidigital number, since it uses as much as digits as its factorization.

20692489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22666.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 20692489 is about 4548.8997570841. The cubic root of 20692489 is about 274.5391244638.

The spelling of 20692489 in words is "twenty million, six hundred ninety-two thousand, four hundred eighty-nine".