20850870 has 32 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 5544800.

The previous prime is 20850853. The next prime is 20850871. The reversal of 20850870 is 7805802.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20850871) 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, 13645 + ... + 15095.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^20850870 is an apocalyptic number.

20850870 is an abundant number, since it is smaller than the sum of its proper divisors (29330250).

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

20850870 is a wasteful number, since it uses less digits than its factorization.

20850870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 20850870 is about 4566.2752873650. The cubic root of 20850870 is about 275.2377888183.

The spelling of 20850870 in words is "twenty million, eight hundred fifty thousand, eight hundred seventy".