20940540 has 48 divisors (see below), whose sum is σ = 58843680. Its totient is φ = 5564160.

The previous prime is 20940539. The next prime is 20940547. The reversal of 20940540 is 4504902.

It is a self number, because there is not a number n which added to its sum of digits gives 20940540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20940547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24846 + ... + 25674.

It is an arithmetic number, because the mean of its divisors is an integer number (1225910).

Almost surely, 2^20940540 is an apocalyptic number.

20940540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20940540 is an abundant number, since it is smaller than the sum of its proper divisors (37903140).

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

20940540 is a wasteful number, since it uses less digits than its factorization.

20940540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20940540 is about 4576.0834782595. The cubic root of 20940540 is about 275.6317816010.

The spelling of 20940540 in words is "twenty million, nine hundred forty thousand, five hundred forty".