20390019 has 24 divisors (see below), whose sum is σ = 29760192. Its totient is φ = 12411360.

The previous prime is 20390017. The next prime is 20390039. The reversal of 20390019 is 91009302.

It is a happy number.

It is not a de Polignac number, because 20390019 - 2¹ = 20390017 is a prime.

It is a super-2 number, since 2×20390019² = 831505749640722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20390011) 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, 66264 + ... + 66570.

It is an arithmetic number, because the mean of its divisors is an integer number (1240008).

Almost surely, 2^20390019 is an apocalyptic number.

20390019 is a deficient number, since it is larger than the sum of its proper divisors (9370173).

20390019 is a wasteful number, since it uses less digits than its factorization.

20390019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 20390019 is about 4515.5308658008. The cubic root of 20390019 is about 273.1948722016.

The spelling of 20390019 in words is "twenty million, three hundred ninety thousand, nineteen".