238905220 has 24 divisors (see below), whose sum is σ = 517886208. Its totient is φ = 92479200.

The previous prime is 238905203. The next prime is 238905229. The reversal of 238905220 is 22509832.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (238905229) 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, 192046 + ... + 193285.

It is an arithmetic number, because the mean of its divisors is an integer number (21578592).

Almost surely, 2^238905220 is an apocalyptic number.

238905220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

238905220 is an abundant number, since it is smaller than the sum of its proper divisors (278980988).

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

238905220 is a wasteful number, since it uses less digits than its factorization.

238905220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385371 (or 385369 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 238905220 is about 15456.5591254975. The cubic root of 238905220 is about 620.5001340838.

The spelling of 238905220 in words is "two hundred thirty-eight million, nine hundred five thousand, two hundred twenty".