16220540 has 24 divisors (see below), whose sum is σ = 38929632. Its totient is φ = 5561280.

The previous prime is 16220539. The next prime is 16220549. The reversal of 16220540 is 4502261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16220549) 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, 57791 + ... + 58070.

It is an arithmetic number, because the mean of its divisors is an integer number (1622068).

Almost surely, 2^16220540 is an apocalyptic number.

16220540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16220540 is an abundant number, since it is smaller than the sum of its proper divisors (22709092).

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

16220540 is a wasteful number, since it uses less digits than its factorization.

16220540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115877 (or 115875 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 16220540 is about 4027.4731532314. The cubic root of 16220540 is about 253.1366933581.

It can be divided in two parts, 162 and 20540, that added together give a palindrome (20702).

The spelling of 16220540 in words is "sixteen million, two hundred twenty thousand, five hundred forty".