20693268 has 18 divisors (see below), whose sum is σ = 52308074. Its totient is φ = 6897744.

The previous prime is 20693263. The next prime is 20693273. The reversal of 20693268 is 86239602.

It is an interprime number because it is at equal distance from previous prime (20693263) and next prime (20693273).

It can be written as a sum of positive squares in only one way, i.e., 20629764 + 63504 = 4542^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×20693268² = 856422681039648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 574813 = 20693268 / (2 + 0 + 6 + 9 + 3 + 2 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20693263) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 287371 + ... + 287442.

Almost surely, 2^20693268 is an apocalyptic number.

It is an amenable number.

20693268 is an abundant number, since it is smaller than the sum of its proper divisors (31614806).

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

20693268 is a wasteful number, since it uses less digits than its factorization.

20693268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574823 (or 574818 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20693268 is about 4548.9853813790. The cubic root of 20693268 is about 274.5425695672.

The spelling of 20693268 in words is "twenty million, six hundred ninety-three thousand, two hundred sixty-eight".