55122320 has 40 divisors (see below), whose sum is σ = 139812480. Its totient is φ = 20044160.

The previous prime is 55122317. The next prime is 55122323. The reversal of 55122320 is 2322155.

It is an interprime number because it is at equal distance from previous prime (55122317) and next prime (55122323).

It is a tau number, because it is divible by the number of its divisors (40).

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 = 55122292 and 55122301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55122323) 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, 30440 + ... + 32199.

It is an arithmetic number, because the mean of its divisors is an integer number (3495312).

Almost surely, 2^55122320 is an apocalyptic number.

It is an amenable number.

55122320 is an abundant number, since it is smaller than the sum of its proper divisors (84690160).

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

55122320 is a wasteful number, since it uses less digits than its factorization.

55122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62663 (or 62657 counting only the distinct ones).

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

The square root of 55122320 is about 7424.4407196771. The cubic root of 55122320 is about 380.5769628756.

Adding to 55122320 its reverse (2322155), we get a palindrome (57444475).

It can be divided in two parts, 551 and 22320, that multiplied together give a triangular number (12298320 = T₄₉₅₉).

The spelling of 55122320 in words is "fifty-five million, one hundred twenty-two thousand, three hundred twenty".