20918694 has 16 divisors (see below), whose sum is σ = 41951232. Its totient is φ = 6953928.

The previous prime is 20918629. The next prime is 20918699. The reversal of 20918694 is 49681902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20918699) 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, 2254 + ... + 6849.

It is an arithmetic number, because the mean of its divisors is an integer number (2621952).

Almost surely, 2^20918694 is an apocalyptic number.

20918694 is an abundant number, since it is smaller than the sum of its proper divisors (21032538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20918694 is a wasteful number, since it uses less digits than its factorization.

20918694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 20918694 is about 4573.6958797017. The cubic root of 20918694 is about 275.5358982562.

It can be divided in two parts, 20918 and 694, that added together give a palindrome (21612).

The spelling of 20918694 in words is "twenty million, nine hundred eighteen thousand, six hundred ninety-four".