20606690 has 32 divisors (see below), whose sum is σ = 40155696. Its totient is φ = 7568640.

The previous prime is 20606681. The next prime is 20606711. The reversal of 20606690 is 9660602.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9431041 + 11175649 = 3071^2 + 3343^2 .

It is a super-2 number, since 2×20606690² = 849271345512200, 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, 37820 + ... + 38360.

Almost surely, 2^20606690 is an apocalyptic number.

20606690 is a deficient number, since it is larger than the sum of its proper divisors (19549006).

20606690 is a wasteful number, since it uses less digits than its factorization.

20606690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20606690 is about 4539.4592188938. The cubic root of 20606690 is about 274.1591506189.

The spelling of 20606690 in words is "twenty million, six hundred six thousand, six hundred ninety".