20894618 has 4 divisors (see below), whose sum is σ = 31341930. Its totient is φ = 10447308.

The previous prime is 20894617. The next prime is 20894633. The reversal of 20894618 is 81649802.

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., 20584369 + 310249 = 4537^2 + 557^2 .

It is a super-2 number, since 2×20894618² = 873170122731848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20894617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5223653 + ... + 5223656.

Almost surely, 2^20894618 is an apocalyptic number.

20894618 is a deficient number, since it is larger than the sum of its proper divisors (10447312).

20894618 is a wasteful number, since it uses less digits than its factorization.

20894618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10447311.

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

The square root of 20894618 is about 4571.0631148563. The cubic root of 20894618 is about 275.4301499570.

It can be divided in two parts, 20894 and 618, that added together give a palindrome (21512).

The spelling of 20894618 in words is "twenty million, eight hundred ninety-four thousand, six hundred eighteen".