16820442 has 12 divisors (see below), whose sum is σ = 36444330. Its totient is φ = 5606808.

The previous prime is 16820437. The next prime is 16820477. The reversal of 16820442 is 24402861.

It can be written as a sum of positive squares in only one way, i.e., 10055241 + 6765201 = 3171^2 + 2601^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 467217 + ... + 467252.

Almost surely, 2^16820442 is an apocalyptic number.

16820442 is an abundant number, since it is smaller than the sum of its proper divisors (19623888).

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

16820442 is a wasteful number, since it uses less digits than its factorization.

16820442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934477 (or 934474 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 16820442 is about 4101.2732169413. The cubic root of 16820442 is about 256.2196702552.

The spelling of 16820442 in words is "sixteen million, eight hundred twenty thousand, four hundred forty-two".