20201890 has 16 divisors (see below), whose sum is σ = 36652032. Its totient is φ = 8016624.

The previous prime is 20201849. The next prime is 20201891. The reversal of 20201890 is 9810202.

It is not an unprimeable number, because it can be changed into a prime (20201891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6684 + ... + 9223.

It is an arithmetic number, because the mean of its divisors is an integer number (2290752).

Almost surely, 2^20201890 is an apocalyptic number.

20201890 is a deficient number, since it is larger than the sum of its proper divisors (16450142).

20201890 is a wasteful number, since it uses less digits than its factorization.

20201890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16041.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20201890 is about 4494.6512656712. The cubic root of 20201890 is about 272.3520617756.

The spelling of 20201890 in words is "twenty million, two hundred one thousand, eight hundred ninety".