20283840 has 84 divisors (see below), whose sum is σ = 69777864. Its totient is φ = 5408256.

The previous prime is 20283821. The next prime is 20283841. The reversal of 20283840 is 4838202.

It is a super-2 number, since 2×20283840² = 822868330291200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20283841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 642 + ... + 6401.

Almost surely, 2^20283840 is an apocalyptic number.

20283840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20283840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34888932).

20283840 is an abundant number, since it is smaller than the sum of its proper divisors (49494024).

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

20283840 is a wasteful number, since it uses less digits than its factorization.

20283840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066 (or 7053 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20283840 is about 4503.7584304667. The cubic root of 20283840 is about 272.7198349487.

The spelling of 20283840 in words is "twenty million, two hundred eighty-three thousand, eight hundred forty".