16620740 has 12 divisors (see below), whose sum is σ = 34903596. Its totient is φ = 6648288.

The previous prime is 16620727. The next prime is 16620749. The reversal of 16620740 is 4702661.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 4910656 = 3422^2 + 2216^2 .

It is not an unprimeable number, because it can be changed into a prime (16620749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415499 + ... + 415538.

It is an arithmetic number, because the mean of its divisors is an integer number (2908633).

Almost surely, 2^16620740 is an apocalyptic number.

16620740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16620740 is an abundant number, since it is smaller than the sum of its proper divisors (18282856).

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

16620740 is a wasteful number, since it uses less digits than its factorization.

16620740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831046 (or 831044 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 16620740 is about 4076.8541793888. The cubic root of 16620740 is about 255.2016347022.

The spelling of 16620740 in words is "sixteen million, six hundred twenty thousand, seven hundred forty".