20235540 has 48 divisors (see below), whose sum is σ = 61020288. Its totient is φ = 4980864.

The previous prime is 20235511. The next prime is 20235547. The reversal of 20235540 is 4553202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235547) 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, 12192 + ... + 13751.

It is an arithmetic number, because the mean of its divisors is an integer number (1271256).

Almost surely, 2^20235540 is an apocalyptic number.

20235540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20235540 is an abundant number, since it is smaller than the sum of its proper divisors (40784748).

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

20235540 is a wasteful number, since it uses less digits than its factorization.

20235540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25968 (or 25966 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20235540 is about 4498.3930464111. The cubic root of 20235540 is about 272.5031955409.

Adding to 20235540 its reverse (4553202), we get a palindrome (24788742).

The spelling of 20235540 in words is "twenty million, two hundred thirty-five thousand, five hundred forty".