51202420 has 24 divisors (see below), whose sum is σ = 108637704. Its totient is φ = 20269056.

The previous prime is 51202387. The next prime is 51202471. The reversal of 51202420 is 2420215.

51202420 = 678² + 679² + ... + 774².

It can be written as a sum of positive squares in 4 ways, for example, as 3481956 + 47720464 = 1866^2 + 6908^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51202394 and 51202403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11257 + ... + 15136.

It is an arithmetic number, because the mean of its divisors is an integer number (4526571).

Almost surely, 2^51202420 is an apocalyptic number.

It is an amenable number.

51202420 is an abundant number, since it is smaller than the sum of its proper divisors (57435284).

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

51202420 is a wasteful number, since it uses less digits than its factorization.

51202420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26499 (or 26497 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 51202420 is about 7155.5866286420. The cubic root of 51202420 is about 371.3329569328.

Adding to 51202420 its reverse (2420215), we get a palindrome (53622635).

It can be divided in two parts, 5120 and 2420, that multiplied together give a square (12390400 = 3520²).

The spelling of 51202420 in words is "fifty-one million, two hundred two thousand, four hundred twenty".