20604881 has 4 divisors (see below), whose sum is σ = 22478064. Its totient is φ = 18731700.

The previous prime is 20604827. The next prime is 20604917. The reversal of 20604881 is 18840602.

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 20604881 - 2²² = 16410577 is a prime.

It is a super-2 number, since 2×20604881² = 849122242048322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20604811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936575 + ... + 936596.

It is an arithmetic number, because the mean of its divisors is an integer number (5619516).

Almost surely, 2^20604881 is an apocalyptic number.

It is an amenable number.

20604881 is a deficient number, since it is larger than the sum of its proper divisors (1873183).

20604881 is a wasteful number, since it uses less digits than its factorization.

20604881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873182.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20604881 is about 4539.2599617118. The cubic root of 20604881 is about 274.1511278455.

The spelling of 20604881 in words is "twenty million, six hundred four thousand, eight hundred eighty-one".