20654906 has 4 divisors (see below), whose sum is σ = 30982362. Its totient is φ = 10327452.

The previous prime is 20654903. The next prime is 20654923. The reversal of 20654906 is 60945602.

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

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 34225 = 4541^2 + 185^2 .

It is not an unprimeable number, because it can be changed into a prime (20654903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5163725 + ... + 5163728.

Almost surely, 2^20654906 is an apocalyptic number.

20654906 is a deficient number, since it is larger than the sum of its proper divisors (10327456).

20654906 is a wasteful number, since it uses less digits than its factorization.

20654906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10327455.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20654906 is about 4544.7668807102. The cubic root of 20654906 is about 274.3728119923.

The spelling of 20654906 in words is "twenty million, six hundred fifty-four thousand, nine hundred six".