51435020 has 96 divisors (see below), whose sum is σ = 135475200. Its totient is φ = 15969024.

The previous prime is 51435011. The next prime is 51435023. The reversal of 51435020 is 2053415.

It is a super-2 number, since 2×51435020² = 5291122564800800, which contains 22 as substring.

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 = 51434983 and 51435001.

It is not an unprimeable number, because it can be changed into a prime (51435023) 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, 107141 + ... + 107619.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^51435020 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 51435020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67737600).

51435020 is an abundant number, since it is smaller than the sum of its proper divisors (84040180).

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

51435020 is a wasteful number, since it uses less digits than its factorization.

51435020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51435020 is about 7171.8212470753. The cubic root of 51435020 is about 371.8943990539.

Adding to 51435020 its reverse (2053415), we get a palindrome (53488435).

The spelling of 51435020 in words is "fifty-one million, four hundred thirty-five thousand, twenty".