20536540 has 24 divisors (see below), whose sum is σ = 43211952. Its totient is φ = 8198400.

The previous prime is 20536519. The next prime is 20536547. The reversal of 20536540 is 4563502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536547) 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, 19015 + ... + 20065.

It is an arithmetic number, because the mean of its divisors is an integer number (1800498).

Almost surely, 2^20536540 is an apocalyptic number.

20536540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20536540 is an abundant number, since it is smaller than the sum of its proper divisors (22675412).

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

20536540 is a wasteful number, since it uses less digits than its factorization.

20536540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037 (or 2035 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20536540 is about 4531.7259405220. The cubic root of 20536540 is about 273.8476962725.

The spelling of 20536540 in words is "twenty million, five hundred thirty-six thousand, five hundred forty".