20426686 has 16 divisors (see below), whose sum is σ = 35205120. Its totient is φ = 8707320.

The previous prime is 20426647. The next prime is 20426689. The reversal of 20426686 is 68662402.

It is a super-3 number, since 3×20426686³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426689) 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, 1146 + ... + 6493.

It is an arithmetic number, because the mean of its divisors is an integer number (2200320).

Almost surely, 2^20426686 is an apocalyptic number.

20426686 is a deficient number, since it is larger than the sum of its proper divisors (14778434).

20426686 is a wasteful number, since it uses less digits than its factorization.

20426686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7839.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 20426686 is about 4519.5891406189. The cubic root of 20426686 is about 273.3585345922.

It can be divided in two parts, 20426 and 686, that added together give a palindrome (21112).

The spelling of 20426686 in words is "twenty million, four hundred twenty-six thousand, six hundred eighty-six".