20038705 has 4 divisors (see below), whose sum is σ = 24046452. Its totient is φ = 16030960.

The previous prime is 20038687. The next prime is 20038723. The reversal of 20038705 is 50783002.

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

It is an interprime number because it is at equal distance from previous prime (20038687) and next prime (20038723).

It can be written as a sum of positive squares in 2 ways, for example, as 6466849 + 13571856 = 2543^2 + 3684^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20038705 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 20038705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003866 + ... + 2003875.

It is an arithmetic number, because the mean of its divisors is an integer number (6011613).

Almost surely, 2^20038705 is an apocalyptic number.

It is an amenable number.

20038705 is a deficient number, since it is larger than the sum of its proper divisors (4007747).

20038705 is an equidigital number, since it uses as much as digits as its factorization.

20038705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007746.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20038705 is about 4476.4612139501. The cubic root of 20038705 is about 271.6167513815.

The spelling of 20038705 in words is "twenty million, thirty-eight thousand, seven hundred five".