20383540 has 12 divisors (see below), whose sum is σ = 42805476. Its totient is φ = 8153408.

The previous prime is 20383537. The next prime is 20383541. The reversal of 20383540 is 4538302.

It can be written as a sum of positive squares in 2 ways, for example, as 2439844 + 17943696 = 1562^2 + 4236^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20383541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509569 + ... + 509608.

It is an arithmetic number, because the mean of its divisors is an integer number (3567123).

Almost surely, 2^20383540 is an apocalyptic number.

20383540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20383540 is an abundant number, since it is smaller than the sum of its proper divisors (22421936).

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

20383540 is a wasteful number, since it uses less digits than its factorization.

20383540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019186 (or 1019184 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20383540 is about 4514.8133959224. The cubic root of 20383540 is about 273.1659329268.

The spelling of 20383540 in words is "twenty million, three hundred eighty-three thousand, five hundred forty".