16031920 has 40 divisors (see below), whose sum is σ = 38899296. Its totient is φ = 6133248.

The previous prime is 16031909. The next prime is 16031921. The reversal of 16031920 is 2913061.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 16031891 and 16031900.

It is not an unprimeable number, because it can be changed into a prime (16031921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2517 + ... + 6196.

Almost surely, 2^16031920 is an apocalyptic number.

16031920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16031920 is an abundant number, since it is smaller than the sum of its proper divisors (22867376).

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

16031920 is a wasteful number, since it uses less digits than its factorization.

16031920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749 (or 8743 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 16031920 is about 4003.9880119701. The cubic root of 16031920 is about 252.1516681682.

Adding to 16031920 its reverse (2913061), we get a palindrome (18944981).

The spelling of 16031920 in words is "sixteen million, thirty-one thousand, nine hundred twenty".