16720438 has 16 divisors (see below), whose sum is σ = 29274624. Its totient is φ = 7013160.

The previous prime is 16720427. The next prime is 16720441. The reversal of 16720438 is 83402761.

It is a congruent 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, 12048 + ... + 13363.

It is an arithmetic number, because the mean of its divisors is an integer number (1829664).

Almost surely, 2^16720438 is an apocalyptic number.

16720438 is a deficient number, since it is larger than the sum of its proper divisors (12554186).

16720438 is a wasteful number, since it uses less digits than its factorization.

16720438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25467.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 16720438 is about 4089.0632179021. The cubic root of 16720438 is about 255.7108857692.

The spelling of 16720438 in words is "sixteen million, seven hundred twenty thousand, four hundred thirty-eight".