20877901 has 4 divisors (see below), whose sum is σ = 22775904. Its totient is φ = 18979900.

The previous prime is 20877889. The next prime is 20877907. The reversal of 20877901 is 10977802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20877901 - 2⁵ = 20877869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20877907) 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 3 ways as a sum of consecutive naturals, for example, 948985 + ... + 949006.

It is an arithmetic number, because the mean of its divisors is an integer number (5693976).

Almost surely, 2^20877901 is an apocalyptic number.

It is an amenable number.

20877901 is a deficient number, since it is larger than the sum of its proper divisors (1898003).

20877901 is a wasteful number, since it uses less digits than its factorization.

20877901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898002.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 20877901 is about 4569.2341809104. The cubic root of 20877901 is about 275.3566765824.

Subtracting from 20877901 its reverse (10977802), we obtain a palindrome (9900099).

The spelling of 20877901 in words is "twenty million, eight hundred seventy-seven thousand, nine hundred one".