20008919 has 32 divisors (see below), whose sum is σ = 26050560. Its totient is φ = 14968800.

The previous prime is 20008913. The next prime is 20008921. The reversal of 20008919 is 91980002.

It is not a de Polignac number, because 20008919 - 2⁴ = 20008903 is a prime.

It is a super-2 number, since 2×20008919² = 800713679097122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20008891 and 20008900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94724 + ... + 94934.

It is an arithmetic number, because the mean of its divisors is an integer number (814080).

Almost surely, 2^20008919 is an apocalyptic number.

20008919 is a deficient number, since it is larger than the sum of its proper divisors (6041641).

20008919 is a wasteful number, since it uses less digits than its factorization.

20008919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 20008919 is about 4473.1330183664. The cubic root of 20008919 is about 271.4821054808.

The spelling of 20008919 in words is "twenty million, eight thousand, nine hundred nineteen".