20634218 has 8 divisors (see below), whose sum is σ = 33765120. Its totient is φ = 9379180.

The previous prime is 20634217. The next prime is 20634221. The reversal of 20634218 is 81243602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20634217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468938 + ... + 468981.

It is an arithmetic number, because the mean of its divisors is an integer number (4220640).

Almost surely, 2^20634218 is an apocalyptic number.

20634218 is a deficient number, since it is larger than the sum of its proper divisors (13130902).

20634218 is a wasteful number, since it uses less digits than its factorization.

20634218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937932.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20634218 is about 4542.4902861756. The cubic root of 20634218 is about 274.2811772511.

The spelling of 20634218 in words is "twenty million, six hundred thirty-four thousand, two hundred eighteen".