20874955 has 4 divisors (see below), whose sum is σ = 25049952. Its totient is φ = 16699960.

The previous prime is 20874949. The next prime is 20874979. The reversal of 20874955 is 55947802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55947802 = 2 ⋅27973901.

It is not a de Polignac number, because 20874955 - 2³ = 20874947 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087491 + ... + 2087500.

It is an arithmetic number, because the mean of its divisors is an integer number (6262488).

Almost surely, 2^20874955 is an apocalyptic number.

20874955 is a deficient number, since it is larger than the sum of its proper divisors (4174997).

20874955 is an equidigital number, since it uses as much as digits as its factorization.

20874955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4174996.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 20874955 is about 4568.9117960407. The cubic root of 20874955 is about 275.3437244673.

The spelling of 20874955 in words is "twenty million, eight hundred seventy-four thousand, nine hundred fifty-five".