20477866 has 16 divisors (see below), whose sum is σ = 32166144. Its totient is φ = 9759024.

The previous prime is 20477833. The next prime is 20477881. The reversal of 20477866 is 66877402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16276 + ... + 17488.

It is an arithmetic number, because the mean of its divisors is an integer number (2010384).

Almost surely, 2^20477866 is an apocalyptic number.

20477866 is a deficient number, since it is larger than the sum of its proper divisors (11688278).

20477866 is a wasteful number, since it uses less digits than its factorization.

20477866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 20477866 is about 4525.2476175343. The cubic root of 20477866 is about 273.5866483031.

The spelling of 20477866 in words is "twenty million, four hundred seventy-seven thousand, eight hundred sixty-six".