20331516 has 24 divisors (see below), whose sum is σ = 47975760. Its totient is φ = 6700672.

The previous prime is 20331503. The next prime is 20331533. The reversal of 20331516 is 61513302.

It is a junction number, because it is equal to n+sod(n) for n = 20331492 and 20331501.

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, 8451 + ... + 10586.

It is an arithmetic number, because the mean of its divisors is an integer number (1998990).

Almost surely, 2^20331516 is an apocalyptic number.

It is an amenable number.

20331516 is an abundant number, since it is smaller than the sum of its proper divisors (27644244).

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

20331516 is a wasteful number, since it uses less digits than its factorization.

20331516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19133 (or 19131 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20331516 is about 4509.0482366016. The cubic root of 20331516 is about 272.9333385253.

Adding to 20331516 its reverse (61513302), we get a palindrome (81844818).

The spelling of 20331516 in words is "twenty million, three hundred thirty-one thousand, five hundred sixteen".