20664403742 has 16 divisors (see below), whose sum is σ = 31257801072. Its totient is φ = 10245406080.

The previous prime is 20664403741. The next prime is 20664403769. The reversal of 20664403742 is 24730446602.

It is a junction number, because it is equal to n+sod(n) for n = 20664403696 and 20664403705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664403741) 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, 87158 + ... + 221190.

It is an arithmetic number, because the mean of its divisors is an integer number (1953612567).

Almost surely, 2^20664403742 is an apocalyptic number.

20664403742 is a deficient number, since it is larger than the sum of its proper divisors (10593397330).

20664403742 is a wasteful number, since it uses less digits than its factorization.

20664403742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134683.

The product of its (nonzero) digits is 193536, while the sum is 38.

The spelling of 20664403742 in words is "twenty billion, six hundred sixty-four million, four hundred three thousand, seven hundred forty-two".