20011690 has 16 divisors (see below), whose sum is σ = 36900360. Its totient is φ = 7809280.

The previous prime is 20011681. The next prime is 20011697. The reversal of 20011690 is 9611002.

It can be written as a sum of positive squares in 4 ways, for example, as 9259849 + 10751841 = 3043^2 + 3279^2 .

It is a super-2 number, since 2×20011690² = 800935473312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20011697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23995 + ... + 24814.

Almost surely, 2^20011690 is an apocalyptic number.

20011690 is a deficient number, since it is larger than the sum of its proper divisors (16888670).

20011690 is a wasteful number, since it uses less digits than its factorization.

20011690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48857.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20011690 is about 4473.4427458055. The cubic root of 20011690 is about 271.4946372621.

Adding to 20011690 its reverse (9611002), we get a palindrome (29622692).

The spelling of 20011690 in words is "twenty million, eleven thousand, six hundred ninety".