20947118 has 4 divisors (see below), whose sum is σ = 31420680. Its totient is φ = 10473558.

The previous prime is 20947109. The next prime is 20947133. The reversal of 20947118 is 81174902.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5236778 + ... + 5236781.

It is an arithmetic number, because the mean of its divisors is an integer number (7855170).

Almost surely, 2^20947118 is an apocalyptic number.

20947118 is a deficient number, since it is larger than the sum of its proper divisors (10473562).

20947118 is a wasteful number, since it uses less digits than its factorization.

20947118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10473561.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 20947118 is about 4576.8021587130. The cubic root of 20947118 is about 275.6606397560.

The spelling of 20947118 in words is "twenty million, nine hundred forty-seven thousand, one hundred eighteen".