20257743602 has 16 divisors (see below), whose sum is σ = 30435645240. Its totient is φ = 10112543232.

The previous prime is 20257743563. The next prime is 20257743629. The reversal of 20257743602 is 20634775202.

It can be written as a sum of positive squares in 4 ways, for example, as 20013477961 + 244265641 = 141469^2 + 15629^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5636318 + ... + 5639910.

Almost surely, 2^20257743602 is an apocalyptic number.

20257743602 is a deficient number, since it is larger than the sum of its proper divisors (10177901638).

20257743602 is a wasteful number, since it uses less digits than its factorization.

20257743602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7357.

The product of its (nonzero) digits is 141120, while the sum is 38.

The spelling of 20257743602 in words is "twenty billion, two hundred fifty-seven million, seven hundred forty-three thousand, six hundred two".