20735890 has 48 divisors (see below), whose sum is σ = 44180928. Its totient is φ = 6860448.

The previous prime is 20735887. The next prime is 20735893. The reversal of 20735890 is 9853702.

It is an interprime number because it is at equal distance from previous prime (20735887) and next prime (20735893).

It is not an unprimeable number, because it can be changed into a prime (20735893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 249789 + ... + 249871.

It is an arithmetic number, because the mean of its divisors is an integer number (920436).

Almost surely, 2^20735890 is an apocalyptic number.

20735890 is an abundant number, since it is smaller than the sum of its proper divisors (23445038).

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

20735890 is an equidigital number, since it uses as much as digits as its factorization.

20735890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20735890 is about 4553.6677524826. The cubic root of 20735890 is about 274.7309324150.

The spelling of 20735890 in words is "twenty million, seven hundred thirty-five thousand, eight hundred ninety".