20618894 has 4 divisors (see below), whose sum is σ = 30928344. Its totient is φ = 10309446.

The previous prime is 20618893. The next prime is 20618903. The reversal of 20618894 is 49881602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49881602 = 2 ⋅24940801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5154722 + ... + 5154725.

It is an arithmetic number, because the mean of its divisors is an integer number (7732086).

Almost surely, 2^20618894 is an apocalyptic number.

20618894 is a deficient number, since it is larger than the sum of its proper divisors (10309450).

20618894 is a wasteful number, since it uses less digits than its factorization.

20618894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10309449.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20618894 is about 4540.8032329093. The cubic root of 20618894 is about 274.2132621394.

It can be divided in two parts, 20618 and 894, that added together give a palindrome (21512).

The spelling of 20618894 in words is "twenty million, six hundred eighteen thousand, eight hundred ninety-four".