20886718 has 4 divisors (see below), whose sum is σ = 31330080. Its totient is φ = 10443358.

The previous prime is 20886713. The next prime is 20886739. The reversal of 20886718 is 81768802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81768802 = 2 ⋅40884401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20886713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5221678 + ... + 5221681.

It is an arithmetic number, because the mean of its divisors is an integer number (7832520).

Almost surely, 2^20886718 is an apocalyptic number.

20886718 is a deficient number, since it is larger than the sum of its proper divisors (10443362).

20886718 is a wasteful number, since it uses less digits than its factorization.

20886718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443361.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 20886718 is about 4570.1989015797. The cubic root of 20886718 is about 275.3954333222.

The spelling of 20886718 in words is "twenty million, eight hundred eighty-six thousand, seven hundred eighteen".