20880879 has 8 divisors (see below), whose sum is σ = 29478960. Its totient is φ = 13101696.

The previous prime is 20880877. The next prime is 20880883. The reversal of 20880879 is 97808802.

It is a happy number.

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

It is not a de Polignac number, because 20880879 - 2¹ = 20880877 is a prime.

It is a super-2 number, since 2×20880879² = 872022215625282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20880879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20880877) 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, 204664 + ... + 204765.

It is an arithmetic number, because the mean of its divisors is an integer number (3684870).

Almost surely, 2^20880879 is an apocalyptic number.

20880879 is a deficient number, since it is larger than the sum of its proper divisors (8598081).

20880879 is a wasteful number, since it uses less digits than its factorization.

20880879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409449.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 20880879 is about 4569.5600444682. The cubic root of 20880879 is about 275.3697681474.

The spelling of 20880879 in words is "twenty million, eight hundred eighty thousand, eight hundred seventy-nine".