20203533240 has 256 divisors, whose sum is σ = 68910912000. Its totient is φ = 4693678080.

The previous prime is 20203533221. The next prime is 20203533277. The reversal of 20203533240 is 4233530202.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20203533240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5319022 + ... + 5322818.

It is an arithmetic number, because the mean of its divisors is an integer number (269183250).

Almost surely, 2^20203533240 is an apocalyptic number.

20203533240 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 20203533240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34455456000).

20203533240 is an abundant number, since it is smaller than the sum of its proper divisors (48707378760).

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

20203533240 is a wasteful number, since it uses less digits than its factorization.

20203533240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990 (or 3986 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 24.

The spelling of 20203533240 in words is "twenty billion, two hundred three million, five hundred thirty-three thousand, two hundred forty".