20213986 has 64 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 7934976.

The previous prime is 20213983. The next prime is 20214001. The reversal of 20213986 is 68931202.

It is not an unprimeable number, because it can be changed into a prime (20213981) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 243501 + ... + 243583.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

Almost surely, 2^20213986 is an apocalyptic number.

20213986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20213986 is a deficient number, since it is larger than the sum of its proper divisors (17888414).

20213986 is a wasteful number, since it uses less digits than its factorization.

20213986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20213986 is about 4495.9966636998. The cubic root of 20213986 is about 272.4064083944.

The spelling of 20213986 in words is "twenty million, two hundred thirteen thousand, nine hundred eighty-six".