16620420 has 24 divisors (see below), whose sum is σ = 46537344. Its totient is φ = 4432096.

The previous prime is 16620391. The next prime is 16620431. The reversal of 16620420 is 2402661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138444 + ... + 138563.

It is an arithmetic number, because the mean of its divisors is an integer number (1939056).

Almost surely, 2^16620420 is an apocalyptic number.

16620420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16620420 is an abundant number, since it is smaller than the sum of its proper divisors (29916924).

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

16620420 is a wasteful number, since it uses less digits than its factorization.

16620420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277019 (or 277017 counting only the distinct ones).

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

The square root of 16620420 is about 4076.8149332537. The cubic root of 16620420 is about 255.1999968881.

The spelling of 16620420 in words is "sixteen million, six hundred twenty thousand, four hundred twenty".