20234540 has 24 divisors (see below), whose sum is σ = 42723072. Its totient is φ = 8049920.

The previous prime is 20234521. The next prime is 20234551. The reversal of 20234540 is 4543202.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 1172 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (1780128).

Almost surely, 2^20234540 is an apocalyptic number.

20234540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20234540 is an abundant number, since it is smaller than the sum of its proper divisors (22488532).

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

20234540 is a wasteful number, since it uses less digits than its factorization.

20234540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5497 (or 5495 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20234540 is about 4498.2818942347. The cubic root of 20234540 is about 272.4987066123.

Adding to 20234540 its reverse (4543202), we get a palindrome (24777742).

The spelling of 20234540 in words is "twenty million, two hundred thirty-four thousand, five hundred forty".