20800540 has 24 divisors (see below), whose sum is σ = 45188640. Its totient is φ = 8033088.

The previous prime is 20800531. The next prime is 20800543. The reversal of 20800540 is 4500802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20800543) 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, 17352 + ... + 18511.

It is an arithmetic number, because the mean of its divisors is an integer number (1882860).

Almost surely, 2^20800540 is an apocalyptic number.

20800540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20800540 is an abundant number, since it is smaller than the sum of its proper divisors (24388100).

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

20800540 is a wasteful number, since it uses less digits than its factorization.

20800540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35901 (or 35899 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20800540 is about 4560.7609014286. The cubic root of 20800540 is about 275.0161533211.

The spelling of 20800540 in words is "twenty million, eight hundred thousand, five hundred forty".