252721020 has 48 divisors (see below), whose sum is σ = 708317568. Its totient is φ = 67325760.

The previous prime is 252720977. The next prime is 252721061. The reversal of 252721020 is 20127252.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103615 + ... + 106025.

It is an arithmetic number, because the mean of its divisors is an integer number (14756616).

Almost surely, 2^252721020 is an apocalyptic number.

252721020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252721020 is an abundant number, since it is smaller than the sum of its proper divisors (455596548).

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

252721020 is a wasteful number, since it uses less digits than its factorization.

252721020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170 (or 4168 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 252721020 is about 15897.2016405404. The cubic root of 252721020 is about 632.2377964045.

Adding to 252721020 its reverse (20127252), we get a palindrome (272848272).

The spelling of 252721020 in words is "two hundred fifty-two million, seven hundred twenty-one thousand, twenty".