20877849 has 12 divisors (see below), whose sum is σ = 31130112. Its totient is φ = 13469400.

The previous prime is 20877821. The next prime is 20877851. The reversal of 20877849 is 94877802.

It is not a de Polignac number, because 20877849 - 2¹⁷ = 20746777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20877869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37137 + ... + 37694.

It is an arithmetic number, because the mean of its divisors is an integer number (2594176).

Almost surely, 2^20877849 is an apocalyptic number.

It is an amenable number.

20877849 is a deficient number, since it is larger than the sum of its proper divisors (10252263).

20877849 is a wasteful number, since it uses less digits than its factorization.

20877849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74868 (or 74865 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 20877849 is about 4569.2284906754. The cubic root of 20877849 is about 275.3564479745.

The spelling of 20877849 in words is "twenty million, eight hundred seventy-seven thousand, eight hundred forty-nine".