20085540 has 24 divisors (see below), whose sum is σ = 56239680. Its totient is φ = 5356128.

The previous prime is 20085521. The next prime is 20085553. The reversal of 20085540 is 4558002.

It is a self number, because there is not a number n which added to its sum of digits gives 20085540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167320 + ... + 167439.

It is an arithmetic number, because the mean of its divisors is an integer number (2343320).

Almost surely, 2^20085540 is an apocalyptic number.

20085540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20085540 is an abundant number, since it is smaller than the sum of its proper divisors (36154140).

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

20085540 is a wasteful number, since it uses less digits than its factorization.

20085540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334771 (or 334769 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20085540 is about 4481.6894136029. The cubic root of 20085540 is about 271.8281967259.

The spelling of 20085540 in words is "twenty million, eighty-five thousand, five hundred forty".