20870860 has 12 divisors (see below), whose sum is σ = 43828848. Its totient is φ = 8348336.

The previous prime is 20870813. The next prime is 20870869. The reversal of 20870860 is 6807802.

It is not an unprimeable number, because it can be changed into a prime (20870869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521752 + ... + 521791.

It is an arithmetic number, because the mean of its divisors is an integer number (3652404).

Almost surely, 2^20870860 is an apocalyptic number.

20870860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20870860 is an abundant number, since it is smaller than the sum of its proper divisors (22957988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20870860 is a wasteful number, since it uses less digits than its factorization.

20870860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043552 (or 1043550 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 20870860 is about 4568.4636367164. The cubic root of 20870860 is about 275.3257187393.

The spelling of 20870860 in words is "twenty million, eight hundred seventy thousand, eight hundred sixty".