20290164 has 12 divisors (see below), whose sum is σ = 47343744. Its totient is φ = 6763384.

The previous prime is 20290147. The next prime is 20290183. The reversal of 20290164 is 46109202.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845412 + ... + 845435.

It is an arithmetic number, because the mean of its divisors is an integer number (3945312).

Almost surely, 2^20290164 is an apocalyptic number.

It is an amenable number.

20290164 is an abundant number, since it is smaller than the sum of its proper divisors (27053580).

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

20290164 is a wasteful number, since it uses less digits than its factorization.

20290164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690854 (or 1690852 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20290164 is about 4504.4604560369. The cubic root of 20290164 is about 272.7481744385.

Adding to 20290164 its reverse (46109202), we get a palindrome (66399366).

The spelling of 20290164 in words is "twenty million, two hundred ninety thousand, one hundred sixty-four".