20164390 has 8 divisors (see below), whose sum is σ = 36295920. Its totient is φ = 8065752.

The previous prime is 20164381. The next prime is 20164393. The reversal of 20164390 is 9346102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164393) 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, 1008210 + ... + 1008229.

It is an arithmetic number, because the mean of its divisors is an integer number (4536990).

Almost surely, 2^20164390 is an apocalyptic number.

20164390 is a deficient number, since it is larger than the sum of its proper divisors (16131530).

20164390 is a wasteful number, since it uses less digits than its factorization.

20164390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016446.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20164390 is about 4490.4777028730. The cubic root of 20164390 is about 272.1834384718.

The spelling of 20164390 in words is "twenty million, one hundred sixty-four thousand, three hundred ninety".