16021940 has 48 divisors (see below), whose sum is σ = 38646720. Its totient is φ = 5518080.

The previous prime is 16021937. The next prime is 16021969. The reversal of 16021940 is 4912061.

It is a happy number.

It is a super-2 number, since 2×16021940² = 513405122727200, which contains 22 as substring.

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, 2264 + ... + 6096.

It is an arithmetic number, because the mean of its divisors is an integer number (805140).

Almost surely, 2^16021940 is an apocalyptic number.

16021940 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 16021940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19323360).

16021940 is an abundant number, since it is smaller than the sum of its proper divisors (22624780).

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

16021940 is a wasteful number, since it uses less digits than its factorization.

16021940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872 (or 3870 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16021940 is about 4002.7415604808. The cubic root of 16021940 is about 252.0993351558.

It can be divided in two parts, 16021 and 940, that added together give a palindrome (16961).

The spelling of 16021940 in words is "sixteen million, twenty-one thousand, nine hundred forty".