20879619 has 8 divisors (see below), whose sum is σ = 28518672. Its totient is φ = 13580160.

The previous prime is 20879611. The next prime is 20879627. The reversal of 20879619 is 91697802.

It is an interprime number because it is at equal distance from previous prime (20879611) and next prime (20879627).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20879619 - 2³ = 20879611 is a prime.

It is a super-2 number, since 2×20879619² = 871916979170322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20879611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84754 + ... + 84999.

It is an arithmetic number, because the mean of its divisors is an integer number (3564834).

Almost surely, 2^20879619 is an apocalyptic number.

20879619 is a deficient number, since it is larger than the sum of its proper divisors (7639053).

20879619 is a wasteful number, since it uses less digits than its factorization.

20879619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169797.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 20879619 is about 4569.4221735357. The cubic root of 20879619 is about 275.3642292221.

The spelling of 20879619 in words is "twenty million, eight hundred seventy-nine thousand, six hundred nineteen".