20420360520 has 256 divisors, whose sum is σ = 71221248000. Its totient is φ = 4587549696.

The previous prime is 20420360507. The next prime is 20420360531. The reversal of 20420360520 is 2506302402.

It is a super-2 number, since 2×20420360520² (a number of 21 digits) contains 22 as substring.

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

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, 15965241 + ... + 15966519.

It is an arithmetic number, because the mean of its divisors is an integer number (278208000).

Almost surely, 2^20420360520 is an apocalyptic number.

20420360520 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 20420360520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35610624000).

20420360520 is an abundant number, since it is smaller than the sum of its proper divisors (50800887480).

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

20420360520 is a wasteful number, since it uses less digits than its factorization.

20420360520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 20420360520 its reverse (2506302402), we get a palindrome (22926662922).

The spelling of 20420360520 in words is "twenty billion, four hundred twenty million, three hundred sixty thousand, five hundred twenty".