20812519 has 24 divisors (see below), whose sum is σ = 26217312. Its totient is φ = 16174080.

The previous prime is 20812513. The next prime is 20812523. The reversal of 20812519 is 91521802.

It is not a de Polignac number, because 20812519 - 2³ = 20812511 is a prime.

It is a super-2 number, since 2×20812519² = 866321894250722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812511) 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, 86239 + ... + 86479.

It is an arithmetic number, because the mean of its divisors is an integer number (1092388).

Almost surely, 2^20812519 is an apocalyptic number.

20812519 is a deficient number, since it is larger than the sum of its proper divisors (5404793).

20812519 is a wasteful number, since it uses less digits than its factorization.

20812519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 20812519 is about 4562.0739801104. The cubic root of 20812519 is about 275.0689369874.

The spelling of 20812519 in words is "twenty million, eight hundred twelve thousand, five hundred nineteen".