20697444 has 60 divisors (see below), whose sum is σ = 54641664. Its totient is φ = 6831216.

The previous prime is 20697433. The next prime is 20697451. The reversal of 20697444 is 44479602.

20697444 is a `hidden beast` number, since 206 + 9 + 7 + 444 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20697399 and 20697408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40897 + ... + 41399.

Almost surely, 2^20697444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20697444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27320832).

20697444 is an abundant number, since it is smaller than the sum of its proper divisors (33944220).

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

20697444 is a wasteful number, since it uses less digits than its factorization.

20697444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20697444 is about 4549.4443616776. Note that the first 3 decimals coincide. The cubic root of 20697444 is about 274.5610363243.

The spelling of 20697444 in words is "twenty million, six hundred ninety-seven thousand, four hundred forty-four".