20268407 has 4 divisors (see below), whose sum is σ = 20313216. Its totient is φ = 20223600.

The previous prime is 20268401. The next prime is 20268427. The reversal of 20268407 is 70486202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20268407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20268407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20268401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21719 + ... + 22632.

It is an arithmetic number, because the mean of its divisors is an integer number (5078304).

Almost surely, 2^20268407 is an apocalyptic number.

20268407 is a deficient number, since it is larger than the sum of its proper divisors (44809).

20268407 is an equidigital number, since it uses as much as digits as its factorization.

20268407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44808.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20268407 is about 4502.0447576629. The cubic root of 20268407 is about 272.6506509232.

The spelling of 20268407 in words is "twenty million, two hundred sixty-eight thousand, four hundred seven".