16156420 has 48 divisors (see below), whose sum is σ = 39836160. Its totient is φ = 5387904.

The previous prime is 16156379. The next prime is 16156423. The reversal of 16156420 is 2465161.

It is a super-2 number, since 2×16156420² = 522059814432800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16156423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3621 + ... + 6739.

It is an arithmetic number, because the mean of its divisors is an integer number (829920).

Almost surely, 2^16156420 is an apocalyptic number.

16156420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16156420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19918080).

16156420 is an abundant number, since it is smaller than the sum of its proper divisors (23679740).

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

16156420 is a wasteful number, since it uses less digits than its factorization.

16156420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172 (or 3170 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 16156420 is about 4019.5049446418. The cubic root of 16156420 is about 252.8027020287.

The spelling of 16156420 in words is "sixteen million, one hundred fifty-six thousand, four hundred twenty".