20206543620 has 96 divisors (see below), whose sum is σ = 58872780288. Its totient is φ = 5174221312.

The previous prime is 20206543619. The next prime is 20206543627. The reversal of 20206543620 is 2634560202.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20206543627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81862 + ... + 217058.

It is an arithmetic number, because the mean of its divisors is an integer number (613258128).

Almost surely, 2^20206543620 is an apocalyptic number.

20206543620 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 20206543620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29436390144).

20206543620 is an abundant number, since it is smaller than the sum of its proper divisors (38666236668).

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

20206543620 is a wasteful number, since it uses less digits than its factorization.

20206543620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135309 (or 135307 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 20206543620 in words is "twenty billion, two hundred six million, five hundred forty-three thousand, six hundred twenty".