20257280672 has 12 divisors (see below), whose sum is σ = 39881521386. Its totient is φ = 10128640320.

The previous prime is 20257280671. The next prime is 20257280753. The reversal of 20257280672 is 27608275202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13079124496 + 7178156176 = 114364^2 + 84724^2 .

It is not an unprimeable number, because it can be changed into a prime (20257280671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316519979 + ... + 316520042.

Almost surely, 2^20257280672 is an apocalyptic number.

It is an amenable number.

20257280672 is a deficient number, since it is larger than the sum of its proper divisors (19624240714).

20257280672 is an equidigital number, since it uses as much as digits as its factorization.

20257280672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633040031 (or 633040023 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 20257280672 in words is "twenty billion, two hundred fifty-seven million, two hundred eighty thousand, six hundred seventy-two".