20164380 has 96 divisors (see below), whose sum is σ = 61072704. Its totient is φ = 4952064.

The previous prime is 20164379. The next prime is 20164381. The reversal of 20164380 is 8346102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20164379) and next prime (20164381).

It is a self number, because there is not a number n which added to its sum of digits gives 20164380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53874 + ... + 54246.

It is an arithmetic number, because the mean of its divisors is an integer number (636174).

Almost surely, 2^20164380 is an apocalyptic number.

20164380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20164380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30536352).

20164380 is an abundant number, since it is smaller than the sum of its proper divisors (40908324).

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

20164380 is a wasteful number, since it uses less digits than its factorization.

20164380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20164380 is about 4490.4765894056. The cubic root of 20164380 is about 272.1833934777.

The spelling of 20164380 in words is "twenty million, one hundred sixty-four thousand, three hundred eighty".