20116890 has 32 divisors (see below), whose sum is σ = 53645760. Its totient is φ = 5364432.

The previous prime is 20116871. The next prime is 20116891. The reversal of 20116890 is 9861102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20116891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36984 + ... + 37523.

It is an arithmetic number, because the mean of its divisors is an integer number (1676430).

Almost surely, 2^20116890 is an apocalyptic number.

20116890 is an abundant number, since it is smaller than the sum of its proper divisors (33528870).

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

20116890 is a wasteful number, since it uses less digits than its factorization.

20116890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74523 (or 74517 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20116890 is about 4485.1856148882. The cubic root of 20116890 is about 271.9695485662.

Adding to 20116890 its reverse (9861102), we get a palindrome (29977992).

The spelling of 20116890 in words is "twenty million, one hundred sixteen thousand, eight hundred ninety".