20291768 has 16 divisors (see below), whose sum is σ = 43482480. Its totient is φ = 8696448.

The previous prime is 20291759. The next prime is 20291783. The reversal of 20291768 is 86719202.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181121 + ... + 181232.

It is an arithmetic number, because the mean of its divisors is an integer number (2717655).

Almost surely, 2^20291768 is an apocalyptic number.

20291768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20291768 is an abundant number, since it is smaller than the sum of its proper divisors (23190712).

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

20291768 is a wasteful number, since it uses less digits than its factorization.

20291768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362366 (or 362362 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20291768 is about 4504.6384982593. The cubic root of 20291768 is about 272.7553614437.

The spelling of 20291768 in words is "twenty million, two hundred ninety-one thousand, seven hundred sixty-eight".