20202840 has 96 divisors (see below), whose sum is σ = 75048480. Its totient is φ = 4617216.

The previous prime is 20202829. The next prime is 20202841. The reversal of 20202840 is 4820202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1489 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (781755).

Almost surely, 2^20202840 is an apocalyptic number.

20202840 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 20202840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37524240).

20202840 is an abundant number, since it is smaller than the sum of its proper divisors (54845640).

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

20202840 is a wasteful number, since it uses less digits than its factorization.

20202840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8041 (or 8034 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20202840 is about 4494.7569455978. The cubic root of 20202840 is about 272.3563308547.

The spelling of 20202840 in words is "twenty million, two hundred two thousand, eight hundred forty".