20430156 has 24 divisors (see below), whose sum is σ = 47810560. Its totient is φ = 6790032.

The previous prime is 20430143. The next prime is 20430167. The reversal of 20430156 is 65103402.

It is a happy number.

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, 2085 + ... + 6723.

Almost surely, 2^20430156 is an apocalyptic number.

It is an amenable number.

20430156 is an abundant number, since it is smaller than the sum of its proper divisors (27380404).

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

20430156 is a wasteful number, since it uses less digits than its factorization.

20430156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013 (or 5011 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20430156 is about 4519.9730087690. The cubic root of 20430156 is about 273.3740127174.

Adding to 20430156 its reverse (65103402), we get a palindrome (85533558).

The spelling of 20430156 in words is "twenty million, four hundred thirty thousand, one hundred fifty-six".