20726646 has 16 divisors (see below), whose sum is σ = 41664000. Its totient is φ = 6873768.

The previous prime is 20726627. The next prime is 20726647. The reversal of 20726646 is 64662702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7486 + ... + 9873.

It is an arithmetic number, because the mean of its divisors is an integer number (2604000).

Almost surely, 2^20726646 is an apocalyptic number.

20726646 is an abundant number, since it is smaller than the sum of its proper divisors (20937354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20726646 is a wasteful number, since it uses less digits than its factorization.

20726646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17563.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20726646 is about 4552.6526333556. The cubic root of 20726646 is about 274.6901015944.

The spelling of 20726646 in words is "twenty million, seven hundred twenty-six thousand, six hundred forty-six".