20877929 has 8 divisors (see below), whose sum is σ = 21111552. Its totient is φ = 20646000.

The previous prime is 20877907. The next prime is 20877931. The reversal of 20877929 is 92977802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20877929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20877929.

It is not an unprimeable number, because it can be changed into a prime (20877959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55787 + ... + 56159.

It is an arithmetic number, because the mean of its divisors is an integer number (2638944).

Almost surely, 2^20877929 is an apocalyptic number.

It is an amenable number.

20877929 is a deficient number, since it is larger than the sum of its proper divisors (233623).

20877929 is a wasteful number, since it uses less digits than its factorization.

20877929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20877929 is about 4569.2372448802. The cubic root of 20877929 is about 275.3567996788.

The spelling of 20877929 in words is "twenty million, eight hundred seventy-seven thousand, nine hundred twenty-nine".