20364140 has 12 divisors (see below), whose sum is σ = 42764736. Its totient is φ = 8145648.

The previous prime is 20364139. The next prime is 20364151. The reversal of 20364140 is 4146302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1018207 = 20364140 / (2 + 0 + 3 + 6 + 4 + 1 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509084 + ... + 509123.

It is an arithmetic number, because the mean of its divisors is an integer number (3563728).

Almost surely, 2^20364140 is an apocalyptic number.

20364140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20364140 is an abundant number, since it is smaller than the sum of its proper divisors (22400596).

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

20364140 is a wasteful number, since it uses less digits than its factorization.

20364140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018216 (or 1018214 counting only the distinct ones).

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

The square root of 20364140 is about 4512.6644014374. The cubic root of 20364140 is about 273.0792436794.

The spelling of 20364140 in words is "twenty million, three hundred sixty-four thousand, one hundred forty".