20315005 has 8 divisors (see below), whose sum is σ = 24435000. Its totient is φ = 16214016.

The previous prime is 20314981. The next prime is 20315011. The reversal of 20315005 is 50051302.

It can be written as a sum of positive squares in 4 ways, for example, as 5707321 + 14607684 = 2389^2 + 3822^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20315005 - 2¹³ = 20306813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20315005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2280 + ... + 6769.

It is an arithmetic number, because the mean of its divisors is an integer number (3054375).

Almost surely, 2^20315005 is an apocalyptic number.

It is an amenable number.

20315005 is a deficient number, since it is larger than the sum of its proper divisors (4119995).

20315005 is an equidigital number, since it uses as much as digits as its factorization.

20315005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20315005 is about 4507.2169905608. The cubic root of 20315005 is about 272.8594364649.

Adding to 20315005 its reverse (50051302), we get a palindrome (70366307).

It can be divided in two parts, 20 and 315005, that multiplied together give a square (6300100 = 2510²).

The spelling of 20315005 in words is "twenty million, three hundred fifteen thousand, five".