16291920 has 40 divisors (see below), whose sum is σ = 50505696. Its totient is φ = 4344448.

The previous prime is 16291909. The next prime is 16291937. The reversal of 16291920 is 2919261.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 33702 + ... + 34181.

Almost surely, 2^16291920 is an apocalyptic number.

16291920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16291920 is an abundant number, since it is smaller than the sum of its proper divisors (34213776).

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

16291920 is a wasteful number, since it uses less digits than its factorization.

16291920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67899 (or 67893 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 16291920 is about 4036.3250612407. The cubic root of 16291920 is about 253.5074672279.

The spelling of 16291920 in words is "sixteen million, two hundred ninety-one thousand, nine hundred twenty".