20006690 has 32 divisors (see below), whose sum is σ = 39502080. Its totient is φ = 7235200.

The previous prime is 20006683. The next prime is 20006717. The reversal of 20006690 is 9660002.

It is a super-2 number, since 2×20006690² = 800535289512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25910 + ... + 26670.

It is an arithmetic number, because the mean of its divisors is an integer number (1234440).

Almost surely, 2^20006690 is an apocalyptic number.

20006690 is a deficient number, since it is larger than the sum of its proper divisors (19495390).

20006690 is a wasteful number, since it uses less digits than its factorization.

20006690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20006690 is about 4472.8838572000. The cubic root of 20006690 is about 271.4720240419.

Adding to 20006690 its reverse (9660002), we get a palindrome (29666692).

The spelling of 20006690 in words is "twenty million, six thousand, six hundred ninety".