16620240 has 160 divisors (see below), whose sum is σ = 63495936. Its totient is φ = 3502080.

The previous prime is 16620239. The next prime is 16620301. The reversal of 16620240 is 4202661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21460 + ... + 22220.

Almost surely, 2^16620240 is an apocalyptic number.

16620240 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 16620240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31747968).

16620240 is an abundant number, since it is smaller than the sum of its proper divisors (46875696).

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

16620240 is a wasteful number, since it uses less digits than its factorization.

16620240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 16620240 is about 4076.7928571366. The cubic root of 16620240 is about 255.1990756085.

The spelling of 16620240 in words is "sixteen million, six hundred twenty thousand, two hundred forty".