16931220 has 48 divisors (see below), whose sum is σ = 49472640. Its totient is φ = 4318336.

The previous prime is 16931219. The next prime is 16931231. The reversal of 16931220 is 2213961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4755 + ... + 7514.

It is an arithmetic number, because the mean of its divisors is an integer number (1030680).

Almost surely, 2^16931220 is an apocalyptic number.

16931220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16931220 is an abundant number, since it is smaller than the sum of its proper divisors (32541420).

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

16931220 is a wasteful number, since it uses less digits than its factorization.

16931220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12304 (or 12302 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 16931220 is about 4114.7563718889. The cubic root of 16931220 is about 256.7809202544.

The spelling of 16931220 in words is "sixteen million, nine hundred thirty-one thousand, two hundred twenty".