20618494 has 16 divisors (see below), whose sum is σ = 33873840. Its totient is φ = 9354240.

The previous prime is 20618491. The next prime is 20618497. The reversal of 20618494 is 49481602.

It is an interprime number because it is at equal distance from previous prime (20618491) and next prime (20618497).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5187 + ... + 8254.

It is an arithmetic number, because the mean of its divisors is an integer number (2117115).

Almost surely, 2^20618494 is an apocalyptic number.

20618494 is a deficient number, since it is larger than the sum of its proper divisors (13255346).

20618494 is a wasteful number, since it uses less digits than its factorization.

20618494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20618494 is about 4540.7591876249. The cubic root of 20618494 is about 274.2114889112.

It can be divided in two parts, 20618 and 494, that added together give a palindrome (21112).

The spelling of 20618494 in words is "twenty million, six hundred eighteen thousand, four hundred ninety-four".