16720371 has 8 divisors (see below), whose sum is σ = 24770960. Its totient is φ = 11146896.

The previous prime is 16720369. The next prime is 16720409. The reversal of 16720371 is 17302761.

It is not a de Polignac number, because 16720371 - 2¹ = 16720369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 619273 = 16720371 / (1 + 6 + 7 + 2 + 0 + 3 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16720321) 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, 309610 + ... + 309663.

It is an arithmetic number, because the mean of its divisors is an integer number (3096370).

Almost surely, 2^16720371 is an apocalyptic number.

16720371 is a deficient number, since it is larger than the sum of its proper divisors (8050589).

16720371 is an equidigital number, since it uses as much as digits as its factorization.

16720371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619282 (or 619276 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 16720371 is about 4089.0550253084. The cubic root of 16720371 is about 255.7105442181.

The spelling of 16720371 in words is "sixteen million, seven hundred twenty thousand, three hundred seventy-one".