20430540 has 72 divisors (see below), whose sum is σ = 66747408. Its totient is φ = 5028480.

The previous prime is 20430539. The next prime is 20430541. The reversal of 20430540 is 4503402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20430539) and next prime (20430541).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20430541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2026 + ... + 6705.

Almost surely, 2^20430540 is an apocalyptic number.

20430540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430540 is an abundant number, since it is smaller than the sum of its proper divisors (46316868).

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

20430540 is a wasteful number, since it uses less digits than its factorization.

20430540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759 (or 8754 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20430540 is about 4520.0154866991. The cubic root of 20430540 is about 273.3757254627.

Adding to 20430540 its reverse (4503402), we get a palindrome (24933942).

The spelling of 20430540 in words is "twenty million, four hundred thirty thousand, five hundred forty".