20431712 has 48 divisors (see below), whose sum is σ = 46865952. Its totient is φ = 8586240.

The previous prime is 20431687. The next prime is 20431721. The reversal of 20431712 is 21713402.

It is a congruent 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, 11012 + ... + 12732.

It is an arithmetic number, because the mean of its divisors is an integer number (976374).

Almost surely, 2^20431712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23432976).

20431712 is an abundant number, since it is smaller than the sum of its proper divisors (26434240).

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

20431712 is a wasteful number, since it uses less digits than its factorization.

20431712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20431712 is about 4520.1451304134. The cubic root of 20431712 is about 273.3809527715.

The spelling of 20431712 in words is "twenty million, four hundred thirty-one thousand, seven hundred twelve".