20081970 has 24 divisors (see below), whose sum is σ = 52213356. Its totient is φ = 5355168.

The previous prime is 20081969. The next prime is 20081987. The reversal of 20081970 is 7918002.

It can be written as a sum of positive squares in 2 ways, for example, as 19793601 + 288369 = 4449^2 + 537^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111477 + ... + 111656.

Almost surely, 2^20081970 is an apocalyptic number.

20081970 is an abundant number, since it is smaller than the sum of its proper divisors (32131386).

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

20081970 is a wasteful number, since it uses less digits than its factorization.

20081970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223146 (or 223143 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20081970 is about 4481.2911085981. The cubic root of 20081970 is about 271.8120908746.

Adding to 20081970 its reverse (7918002), we get a palindrome (27999972).

The spelling of 20081970 in words is "twenty million, eighty-one thousand, nine hundred seventy".