20391332 has 24 divisors (see below), whose sum is σ = 40454400. Its totient is φ = 8915616.

The previous prime is 20391323. The next prime is 20391353. The reversal of 20391332 is 23319302.

It is a junction number, because it is equal to n+sod(n) for n = 20391298 and 20391307.

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, 9332 + ... + 11307.

It is an arithmetic number, because the mean of its divisors is an integer number (1685600).

Almost surely, 2^20391332 is an apocalyptic number.

It is an amenable number.

20391332 is a deficient number, since it is larger than the sum of its proper divisors (20063068).

20391332 is a wasteful number, since it uses less digits than its factorization.

20391332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20675 (or 20673 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 20391332 is about 4515.6762505742. The cubic root of 20391332 is about 273.2007361354.

The spelling of 20391332 in words is "twenty million, three hundred ninety-one thousand, three hundred thirty-two".