20969331 has 8 divisors (see below), whose sum is σ = 29430720. Its totient is φ = 13243752.

The previous prime is 20969329. The next prime is 20969339. The reversal of 20969331 is 13396902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20969331 - 2¹ = 20969329 is a prime.

It is a super-2 number, since 2×20969331² = 879425685175122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20969292 and 20969301.

It is not an unprimeable number, because it can be changed into a prime (20969339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183885 + ... + 183998.

It is an arithmetic number, because the mean of its divisors is an integer number (3678840).

Almost surely, 2^20969331 is an apocalyptic number.

20969331 is a deficient number, since it is larger than the sum of its proper divisors (8461389).

20969331 is a wasteful number, since it uses less digits than its factorization.

20969331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367905.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 20969331 is about 4579.2282100808. The cubic root of 20969331 is about 275.7580451466.

The spelling of 20969331 in words is "twenty million, nine hundred sixty-nine thousand, three hundred thirty-one".