20431130 has 32 divisors (see below), whose sum is σ = 38648448. Its totient is φ = 7761600.

The previous prime is 20431123. The next prime is 20431171. The reversal of 20431130 is 3113402.

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, 48320 + ... + 48740.

It is an arithmetic number, because the mean of its divisors is an integer number (1207764).

Almost surely, 2^20431130 is an apocalyptic number.

20431130 is a deficient number, since it is larger than the sum of its proper divisors (18217318).

20431130 is a wasteful number, since it uses less digits than its factorization.

20431130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20431130 is about 4520.0807514911. The cubic root of 20431130 is about 273.3783569828.

Adding to 20431130 its reverse (3113402), we get a palindrome (23544532).

The spelling of 20431130 in words is "twenty million, four hundred thirty-one thousand, one hundred thirty".