20537002220 has 48 divisors (see below), whose sum is σ = 51431804928. Its totient is φ = 6735115200.

The previous prime is 20537002217. The next prime is 20537002223. The reversal of 20537002220 is 2220073502.

It is an interprime number because it is at equal distance from previous prime (20537002217) and next prime (20537002223).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (20537002223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3185756 + ... + 3192195.

It is an arithmetic number, because the mean of its divisors is an integer number (1071495936).

Almost surely, 2^20537002220 is an apocalyptic number.

20537002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20537002220 is an abundant number, since it is smaller than the sum of its proper divisors (30894802708).

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

20537002220 is a wasteful number, since it uses less digits than its factorization.

20537002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377990 (or 6377988 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

Adding to 20537002220 its reverse (2220073502), we get a palindrome (22757075722).

The spelling of 20537002220 in words is "twenty billion, five hundred thirty-seven million, two thousand, two hundred twenty".