20193890 has 16 divisors (see below), whose sum is σ = 36400320. Its totient is φ = 8066160.

The previous prime is 20193883. The next prime is 20193913. The reversal of 20193890 is 9839102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12425 + ... + 13955.

It is an arithmetic number, because the mean of its divisors is an integer number (2275020).

Almost surely, 2^20193890 is an apocalyptic number.

20193890 is a deficient number, since it is larger than the sum of its proper divisors (16206430).

20193890 is a wasteful number, since it uses less digits than its factorization.

20193890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20193890 is about 4493.7612308622. The cubic root of 20193890 is about 272.3161063251.

The spelling of 20193890 in words is "twenty million, one hundred ninety-three thousand, eight hundred ninety".