20707642 has 16 divisors (see below), whose sum is σ = 32064552. Its totient is φ = 10022400.

The previous prime is 20707627. The next prime is 20707651. The reversal of 20707642 is 24670702.

It can be written as a sum of positive squares in 4 ways, for example, as 12187081 + 8520561 = 3491^2 + 2919^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20707642.

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, 16642 + ... + 17842.

Almost surely, 2^20707642 is an apocalyptic number.

20707642 is a deficient number, since it is larger than the sum of its proper divisors (11356910).

20707642 is a wasteful number, since it uses less digits than its factorization.

20707642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20707642 is about 4550.5650198629. The cubic root of 20707642 is about 274.6061226275.

The spelling of 20707642 in words is "twenty million, seven hundred seven thousand, six hundred forty-two".