245739220 has 24 divisors (see below), whose sum is σ = 516847464. Its totient is φ = 98144256.

The previous prime is 245739209. The next prime is 245739223. The reversal of 245739220 is 22937542.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4309776 + 241429444 = 2076^2 + 15538^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245739223) 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, 4332 + ... + 22588.

It is an arithmetic number, because the mean of its divisors is an integer number (21535311).

Almost surely, 2^245739220 is an apocalyptic number.

245739220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245739220 is an abundant number, since it is smaller than the sum of its proper divisors (271108244).

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

245739220 is a wasteful number, since it uses less digits than its factorization.

245739220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18939 (or 18937 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 245739220 is about 15676.0715742178. The cubic root of 245739220 is about 626.3611678035.

The spelling of 245739220 in words is "two hundred forty-five million, seven hundred thirty-nine thousand, two hundred twenty".