51460820 has 24 divisors (see below), whose sum is σ = 109841928. Its totient is φ = 20246400.

The previous prime is 51460811. The next prime is 51460823. The reversal of 51460820 is 2806415.

It can be written as a sum of positive squares in 4 ways, for example, as 3740356 + 47720464 = 1934^2 + 6908^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51460820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51460823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19871 + ... + 22310.

It is an arithmetic number, because the mean of its divisors is an integer number (4576747).

Almost surely, 2^51460820 is an apocalyptic number.

It is an amenable number.

51460820 is an abundant number, since it is smaller than the sum of its proper divisors (58381108).

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

51460820 is a wasteful number, since it uses less digits than its factorization.

51460820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42251 (or 42249 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 51460820 is about 7173.6197278640. The cubic root of 51460820 is about 371.9565698711.

The spelling of 51460820 in words is "fifty-one million, four hundred sixty thousand, eight hundred twenty".