20442704 has 30 divisors (see below), whose sum is σ = 42084174. Its totient is φ = 9617920.

The previous prime is 20442691. The next prime is 20442707. The reversal of 20442704 is 40724402.

It can be written as a sum of positive squares in 3 ways, for example, as 11916304 + 8526400 = 3452^2 + 2920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20442704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2414 + ... + 6834.

Almost surely, 2^20442704 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 20442704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21042087).

20442704 is an abundant number, since it is smaller than the sum of its proper divisors (21641470).

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

20442704 is a wasteful number, since it uses less digits than its factorization.

20442704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463 (or 4440 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 23.

The square root of 20442704 is about 4521.3608570872. The cubic root of 20442704 is about 273.4299691357.

The spelling of 20442704 in words is "twenty million, four hundred forty-two thousand, seven hundred four".