55157820 has 48 divisors (see below), whose sum is σ = 158040960. Its totient is φ = 14366016.

The previous prime is 55157813. The next prime is 55157821. The reversal of 55157820 is 2875155.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55157821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8110 + ... + 13269.

It is an arithmetic number, because the mean of its divisors is an integer number (3292520).

Almost surely, 2^55157820 is an apocalyptic number.

It is an amenable number.

55157820 is an abundant number, since it is smaller than the sum of its proper divisors (102883140).

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

55157820 is a wasteful number, since it uses less digits than its factorization.

55157820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21434 (or 21432 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 55157820 is about 7426.8310873481. The cubic root of 55157820 is about 380.6586453524.

The spelling of 55157820 in words is "fifty-five million, one hundred fifty-seven thousand, eight hundred twenty".