20520332120 has 128 divisors (see below), whose sum is σ = 52166980800. Its totient is φ = 7218118656.

The previous prime is 20520332099. The next prime is 20520332197. The reversal of 20520332120 is 2123302502.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20520332092 and 20520332101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 932282 + ... + 954038.

Almost surely, 2^20520332120 is an apocalyptic number.

20520332120 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 20520332120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26083490400).

20520332120 is an abundant number, since it is smaller than the sum of its proper divisors (31646648680).

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

20520332120 is a wasteful number, since it uses less digits than its factorization.

20520332120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21877 (or 21873 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 20520332120 its reverse (2123302502), we get a palindrome (22643634622).

The spelling of 20520332120 in words is "twenty billion, five hundred twenty million, three hundred thirty-two thousand, one hundred twenty".