20735990 has 32 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 7477600.

The previous prime is 20735969. The next prime is 20736017. The reversal of 20735990 is 9953702.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20735990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13691 + ... + 15129.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^20735990 is an apocalyptic number.

20735990 is a deficient number, since it is larger than the sum of its proper divisors (20321290).

20735990 is a wasteful number, since it uses less digits than its factorization.

20735990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20735990 is about 4553.6787326293. The cubic root of 20735990 is about 274.7313740494.

The spelling of 20735990 in words is "twenty million, seven hundred thirty-five thousand, nine hundred ninety".