20707090 has 8 divisors (see below), whose sum is σ = 37272780. Its totient is φ = 8282832.

The previous prime is 20707081. The next prime is 20707097. The reversal of 20707090 is 9070702.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 13689 = 4549^2 + 117^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20707097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035345 + ... + 1035364.

Almost surely, 2^20707090 is an apocalyptic number.

20707090 is a deficient number, since it is larger than the sum of its proper divisors (16565690).

20707090 is a wasteful number, since it uses less digits than its factorization.

20707090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070716.

The product of its (nonzero) digits is 882, while the sum is 25.

The square root of 20707090 is about 4550.5043676498. The cubic root of 20707090 is about 274.6036825633.

Adding to 20707090 its reverse (9070702), we get a palindrome (29777792).

The spelling of 20707090 in words is "twenty million, seven hundred seven thousand, ninety".