20861170 has 32 divisors (see below), whose sum is σ = 41212800. Its totient is φ = 7539840.

The previous prime is 20861167. The next prime is 20861173. The reversal of 20861170 is 7116802.

It is an interprime number because it is at equal distance from previous prime (20861167) and next prime (20861173).

It is not an unprimeable number, because it can be changed into a prime (20861173) 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, 21414 + ... + 22366.

It is an arithmetic number, because the mean of its divisors is an integer number (1287900).

Almost surely, 2^20861170 is an apocalyptic number.

20861170 is a deficient number, since it is larger than the sum of its proper divisors (20351630).

20861170 is a wasteful number, since it uses less digits than its factorization.

20861170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 20861170 is about 4567.4029820019. The cubic root of 20861170 is about 275.2831023959.

Adding to 20861170 its reverse (7116802), we get a palindrome (27977972).

The spelling of 20861170 in words is "twenty million, eight hundred sixty-one thousand, one hundred seventy".