20715015 has 16 divisors (see below), whose sum is σ = 33850368. Its totient is φ = 10812576.

The previous prime is 20715007. The next prime is 20715041. The reversal of 20715015 is 51051702.

It is not a de Polignac number, because 20715015 - 2³ = 20715007 is a prime.

It is a super-2 number, since 2×20715015² = 858223692900450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20714982 and 20715000.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13987 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (2115648).

Almost surely, 2^20715015 is an apocalyptic number.

20715015 is a deficient number, since it is larger than the sum of its proper divisors (13135353).

20715015 is a wasteful number, since it uses less digits than its factorization.

20715015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29438.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20715015 is about 4551.3750669441. The cubic root of 20715015 is about 274.6387101250.

Adding to 20715015 its reverse (51051702), we get a palindrome (71766717).

The spelling of 20715015 in words is "twenty million, seven hundred fifteen thousand, fifteen".