51103042020 has 192 divisors, whose sum is σ = 162311143680. Its totient is φ = 13343616000.

The previous prime is 51103042009. The next prime is 51103042021. The reversal of 51103042020 is 2024030115.

It is a super-3 number, since 3×51103042020³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51103041984 and 51103042002.

It is not an unprimeable number, because it can be changed into a prime (51103042021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17199135 + ... + 17202105.

It is an arithmetic number, because the mean of its divisors is an integer number (845370540).

Almost surely, 2^51103042020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51103042020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81155571840).

51103042020 is an abundant number, since it is smaller than the sum of its proper divisors (111208101660).

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

51103042020 is a wasteful number, since it uses less digits than its factorization.

51103042020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3635 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 51103042020 its reverse (2024030115), we get a palindrome (53127072135).

The spelling of 51103042020 in words is "fifty-one billion, one hundred three million, forty-two thousand, twenty".