20164340 has 24 divisors (see below), whose sum is σ = 48394752. Its totient is φ = 6913440.

The previous prime is 20164321. The next prime is 20164349. The reversal of 20164340 is 4346102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71876 + ... + 72155.

It is an arithmetic number, because the mean of its divisors is an integer number (2016448).

Almost surely, 2^20164340 is an apocalyptic number.

20164340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20164340 is an abundant number, since it is smaller than the sum of its proper divisors (28230412).

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

20164340 is a wasteful number, since it uses less digits than its factorization.

20164340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144047 (or 144045 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20164340 is about 4490.4721355332. The cubic root of 20164340 is about 272.1832135012.

The spelling of 20164340 in words is "twenty million, one hundred sixty-four thousand, three hundred forty".