20142870 has 96 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 4699200.

The previous prime is 20142851. The next prime is 20142887. The reversal of 20142870 is 7824102.

It is a self number, because there is not a number n which added to its sum of digits gives 20142870.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 112441 + ... + 112619.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^20142870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20142870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27578880).

20142870 is an abundant number, since it is smaller than the sum of its proper divisors (35014890).

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

20142870 is a wasteful number, since it uses less digits than its factorization.

20142870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20142870 is about 4488.0808816241. The cubic root of 20142870 is about 272.0865767508.

Adding to 20142870 its reverse (7824102), we get a palindrome (27966972).

It can be divided in two parts, 20142 and 870, that added together give a palindrome (21012).

The spelling of 20142870 in words is "twenty million, one hundred forty-two thousand, eight hundred seventy".