20071890 has 48 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 5286048.

The previous prime is 20071873. The next prime is 20071901. The reversal of 20071890 is 9817002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6127 + ... + 8813.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^20071890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20071890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26417664).

20071890 is an abundant number, since it is smaller than the sum of its proper divisors (32763438).

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

20071890 is a wasteful number, since it uses less digits than its factorization.

20071890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783 (or 2780 counting only the distinct ones).

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

The square root of 20071890 is about 4480.1662915566. The cubic root of 20071890 is about 271.7666052239.

Adding to 20071890 its reverse (9817002), we get a palindrome (29888892).

The spelling of 20071890 in words is "twenty million, seventy-one thousand, eight hundred ninety".