20914918 has 4 divisors (see below), whose sum is σ = 31372380. Its totient is φ = 10457458.

The previous prime is 20914903. The next prime is 20914919. The reversal of 20914918 is 81941902.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20914919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5228728 + ... + 5228731.

It is an arithmetic number, because the mean of its divisors is an integer number (7843095).

Almost surely, 2^20914918 is an apocalyptic number.

20914918 is a deficient number, since it is larger than the sum of its proper divisors (10457462).

20914918 is a wasteful number, since it uses less digits than its factorization.

20914918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10457461.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 20914918 is about 4573.2830658073. The cubic root of 20914918 is about 275.5193184104.

The spelling of 20914918 in words is "twenty million, nine hundred fourteen thousand, nine hundred eighteen".