20353830 has 64 divisors (see below), whose sum is σ = 56429568. Its totient is φ = 4602240.

The previous prime is 20353813. The next prime is 20353849. The reversal of 20353830 is 3835302.

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 20353830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21160 + ... + 22100.

It is an arithmetic number, because the mean of its divisors is an integer number (881712).

Almost surely, 2^20353830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20353830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28214784).

20353830 is an abundant number, since it is smaller than the sum of its proper divisors (36075738).

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

20353830 is a wasteful number, since it uses less digits than its factorization.

20353830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20353830 is about 4511.5219161609. The cubic root of 20353830 is about 273.0331508536.

The spelling of 20353830 in words is "twenty million, three hundred fifty-three thousand, eight hundred thirty".