20266642 has 16 divisors (see below), whose sum is σ = 33242400. Its totient is φ = 9190240.

The previous prime is 20266637. The next prime is 20266643. The reversal of 20266642 is 24666202.

It is a self number, because there is not a number n which added to its sum of digits gives 20266642.

It is not an unprimeable number, because it can be changed into a prime (20266643) 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, 11709 + ... + 13327.

It is an arithmetic number, because the mean of its divisors is an integer number (2077650).

Almost surely, 2^20266642 is an apocalyptic number.

20266642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20266642 is a deficient number, since it is larger than the sum of its proper divisors (12975758).

20266642 is a wasteful number, since it uses less digits than its factorization.

20266642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20266642 is about 4501.8487313547. The cubic root of 20266642 is about 272.6427364323.

It can be divided in two parts, 2026 and 6642, that added together give a palindrome (8668).

The spelling of 20266642 in words is "twenty million, two hundred sixty-six thousand, six hundred forty-two".