20331430 has 32 divisors (see below), whose sum is σ = 42172416. Its totient is φ = 6912864.

The previous prime is 20331419. The next prime is 20331461. The reversal of 20331430 is 3413302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7747 + ... + 10033.

It is an arithmetic number, because the mean of its divisors is an integer number (1317888).

Almost surely, 2^20331430 is an apocalyptic number.

20331430 is an abundant number, since it is smaller than the sum of its proper divisors (21840986).

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

20331430 is a wasteful number, since it uses less digits than its factorization.

20331430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20331430 is about 4509.0387002109. The cubic root of 20331430 is about 272.9329536991.

Adding to 20331430 its reverse (3413302), we get a palindrome (23744732).

The spelling of 20331430 in words is "twenty million, three hundred thirty-one thousand, four hundred thirty".