245551820 has 24 divisors (see below), whose sum is σ = 542799600. Its totient is φ = 93051072.

The previous prime is 245551819. The next prime is 245551843. The reversal of 245551820 is 28155542.

245551820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 322715 + ... + 323474.

It is an arithmetic number, because the mean of its divisors is an integer number (22616650).

Almost surely, 2^245551820 is an apocalyptic number.

245551820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245551820 is an abundant number, since it is smaller than the sum of its proper divisors (297247780).

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

245551820 is a wasteful number, since it uses less digits than its factorization.

245551820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646217 (or 646215 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 245551820 is about 15670.0931713886. The cubic root of 245551820 is about 626.2019069233.

The spelling of 245551820 in words is "two hundred forty-five million, five hundred fifty-one thousand, eight hundred twenty".