20164740 has 24 divisors (see below), whose sum is σ = 56461440. Its totient is φ = 5377248.

The previous prime is 20164733. The next prime is 20164747. The reversal of 20164740 is 4746102.

It is an interprime number because it is at equal distance from previous prime (20164733) and next prime (20164747).

It is a self number, because there is not a number n which added to its sum of digits gives 20164740.

It is not an unprimeable number, because it can be changed into a prime (20164747) 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, 167980 + ... + 168099.

It is an arithmetic number, because the mean of its divisors is an integer number (2352560).

Almost surely, 2^20164740 is an apocalyptic number.

20164740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20164740 is an abundant number, since it is smaller than the sum of its proper divisors (36296700).

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

20164740 is a wasteful number, since it uses less digits than its factorization.

20164740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336091 (or 336089 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20164740 is about 4490.5166740588. The cubic root of 20164740 is about 272.1850132554.

The spelling of 20164740 in words is "twenty million, one hundred sixty-four thousand, seven hundred forty".