20026690 has 8 divisors (see below), whose sum is σ = 36048060. Its totient is φ = 8010672.

The previous prime is 20026681. The next prime is 20026709. The reversal of 20026690 is 9662002.

It can be written as a sum of positive squares in 2 ways, for example, as 19562929 + 463761 = 4423^2 + 681^2 .

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

It is a super-2 number, since 2×20026690² = 802136624712200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001325 + ... + 1001344.

Almost surely, 2^20026690 is an apocalyptic number.

20026690 is a deficient number, since it is larger than the sum of its proper divisors (16021370).

20026690 is a wasteful number, since it uses less digits than its factorization.

20026690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002676.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20026690 is about 4475.1189928314. The cubic root of 20026690 is about 271.5624543309.

Adding to 20026690 its reverse (9662002), we get a palindrome (29688692).

The spelling of 20026690 in words is "twenty million, twenty-six thousand, six hundred ninety".