20121715 has 8 divisors (see below), whose sum is σ = 24601968. Its totient is φ = 15793440.

The previous prime is 20121713. The next prime is 20121719. The reversal of 20121715 is 51712102.

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

It is not a de Polignac number, because 20121715 - 2¹ = 20121713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121692 and 20121701.

It is not an unprimeable number, because it can be changed into a prime (20121713) 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 7 ways as a sum of consecutive naturals, for example, 37701 + ... + 38230.

It is an arithmetic number, because the mean of its divisors is an integer number (3075246).

Almost surely, 2^20121715 is an apocalyptic number.

20121715 is a deficient number, since it is larger than the sum of its proper divisors (4480253).

20121715 is an equidigital number, since it uses as much as digits as its factorization.

20121715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75989.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 20121715 is about 4485.7234645038. The cubic root of 20121715 is about 271.9912906309.

Adding to 20121715 its reverse (51712102), we get a palindrome (71833817).

The spelling of 20121715 in words is "twenty million, one hundred twenty-one thousand, seven hundred fifteen".