20820115 has 16 divisors (see below), whose sum is σ = 26056800. Its totient is φ = 15950592.

The previous prime is 20820113. The next prime is 20820119. The reversal of 20820115 is 51102802.

It is a cyclic number.

It is not a de Polignac number, because 20820115 - 2¹ = 20820113 is a prime.

It is a super-2 number, since 2×20820115² = 866954377226450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20820092 and 20820101.

It is not an unprimeable number, because it can be changed into a prime (20820113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19639 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (1628550).

Almost surely, 2^20820115 is an apocalyptic number.

20820115 is a deficient number, since it is larger than the sum of its proper divisors (5236685).

20820115 is a wasteful number, since it uses less digits than its factorization.

20820115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20820115 is about 4562.9064202545. The cubic root of 20820115 is about 275.1023971291.

Adding to 20820115 its reverse (51102802), we get a palindrome (71922917).

The spelling of 20820115 in words is "twenty million, eight hundred twenty thousand, one hundred fifteen".