20031456 has 96 divisors (see below), whose sum is σ = 55738368. Its totient is φ = 6289920.

The previous prime is 20031449. The next prime is 20031461. The reversal of 20031456 is 65413002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 157665 + ... + 157791.

It is an arithmetic number, because the mean of its divisors is an integer number (580608).

Almost surely, 2^20031456 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 20031456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27869184).

20031456 is an abundant number, since it is smaller than the sum of its proper divisors (35706912).

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

20031456 is a wasteful number, since it uses less digits than its factorization.

20031456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 216 counting only the distinct ones).

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

The square root of 20031456 is about 4475.6514609607. The cubic root of 20031456 is about 271.5839949849.

Adding to 20031456 its reverse (65413002), we get a palindrome (85444458).

The spelling of 20031456 in words is "twenty million, thirty-one thousand, four hundred fifty-six".