20364990 has 16 divisors (see below), whose sum is σ = 48876048. Its totient is φ = 5430656.

The previous prime is 20364983. The next prime is 20364991. The reversal of 20364990 is 9946302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20364991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339387 + ... + 339446.

It is an arithmetic number, because the mean of its divisors is an integer number (3054753).

Almost surely, 2^20364990 is an apocalyptic number.

20364990 is an abundant number, since it is smaller than the sum of its proper divisors (28511058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20364990 is a wasteful number, since it uses less digits than its factorization.

20364990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678843.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20364990 is about 4512.7585798489. The cubic root of 20364990 is about 273.0830430726.

The spelling of 20364990 in words is "twenty million, three hundred sixty-four thousand, nine hundred ninety".