16820744 has 8 divisors (see below), whose sum is σ = 31538910. Its totient is φ = 8410368.

The previous prime is 16820743. The next prime is 16820761. The reversal of 16820744 is 44702861.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 1532644 = 3910^2 + 1238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 16820744.

It is not an unprimeable number, because it can be changed into a prime (16820743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051289 + ... + 1051304.

Almost surely, 2^16820744 is an apocalyptic number.

It is an amenable number.

16820744 is a deficient number, since it is larger than the sum of its proper divisors (14718166).

16820744 is a wasteful number, since it uses less digits than its factorization.

16820744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102599 (or 2102595 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 16820744 is about 4101.3100346109. The cubic root of 16820744 is about 256.2212036648.

The spelling of 16820744 in words is "sixteen million, eight hundred twenty thousand, seven hundred forty-four".