20316638 has 8 divisors (see below), whose sum is σ = 30612288. Its totient is φ = 10112544.

The previous prime is 20316631. The next prime is 20316641. The reversal of 20316638 is 83661302.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20316638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20316631) 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, 22331 + ... + 23222.

It is an arithmetic number, because the mean of its divisors is an integer number (3826536).

Almost surely, 2^20316638 is an apocalyptic number.

20316638 is a deficient number, since it is larger than the sum of its proper divisors (10295650).

20316638 is a wasteful number, since it uses less digits than its factorization.

20316638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45778.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20316638 is about 4507.3981408347. The cubic root of 20316638 is about 272.8667474406.

The spelling of 20316638 in words is "twenty million, three hundred sixteen thousand, six hundred thirty-eight".