20287679 has 6 divisors (see below), whose sum is σ = 21208656. Its totient is φ = 19405100.

The previous prime is 20287637. The next prime is 20287703. The reversal of 20287679 is 97678202.

It is a de Polignac number, because none of the positive numbers 2^k-20287679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18647 + ... + 19704.

It is an arithmetic number, because the mean of its divisors is an integer number (3534776).

Almost surely, 2^20287679 is an apocalyptic number.

20287679 is a deficient number, since it is larger than the sum of its proper divisors (920977).

20287679 is an equidigital number, since it uses as much as digits as its factorization.

20287679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38397 (or 38374 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20287679 is about 4504.1846098933. The cubic root of 20287679 is about 272.7370392092.

The spelling of 20287679 in words is "twenty million, two hundred eighty-seven thousand, six hundred seventy-nine".