20635203745 has 32 divisors (see below), whose sum is σ = 28116950400. Its totient is φ = 14412432384.

The previous prime is 20635203739. The next prime is 20635203749. The reversal of 20635203745 is 54730253602.

It is a cyclic number.

It is not a de Polignac number, because 20635203745 - 2²³ = 20626815137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20635203749) 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 in 31 ways as a sum of consecutive naturals, for example, 750969 + ... + 777961.

It is an arithmetic number, because the mean of its divisors is an integer number (878654700).

Almost surely, 2^20635203745 is an apocalyptic number.

It is an amenable number.

20635203745 is a deficient number, since it is larger than the sum of its proper divisors (7481746655).

20635203745 is a wasteful number, since it uses less digits than its factorization.

20635203745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27649.

The product of its (nonzero) digits is 151200, while the sum is 37.

The spelling of 20635203745 in words is "twenty billion, six hundred thirty-five million, two hundred three thousand, seven hundred forty-five".