20331396 has 18 divisors (see below), whose sum is σ = 51393342. Its totient is φ = 6777120.

The previous prime is 20331373. The next prime is 20331403. The reversal of 20331396 is 69313302.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 617796 = 4440^2 + 786^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282345 + ... + 282416.

Almost surely, 2^20331396 is an apocalyptic number.

It is an amenable number.

20331396 is an abundant number, since it is smaller than the sum of its proper divisors (31061946).

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

20331396 is a wasteful number, since it uses less digits than its factorization.

20331396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564771 (or 564766 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 20331396 is about 4509.0349300044. The cubic root of 20331396 is about 272.9328015582.

Adding to 20331396 its reverse (69313302), we get a palindrome (89644698).

The spelling of 20331396 in words is "twenty million, three hundred thirty-one thousand, three hundred ninety-six".