20661266474 has 4 divisors (see below), whose sum is σ = 30991899714. Its totient is φ = 10330633236.

The previous prime is 20661266473. The next prime is 20661266513. The reversal of 20661266474 is 47466216602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20389840849 + 271425625 = 142793^2 + 16475^2 .

It is not an unprimeable number, because it can be changed into a prime (20661266471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5165316617 + ... + 5165316620.

Almost surely, 2^20661266474 is an apocalyptic number.

20661266474 is a deficient number, since it is larger than the sum of its proper divisors (10330633240).

20661266474 is a wasteful number, since it uses less digits than its factorization.

20661266474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10330633239.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 20661266474 in words is "twenty billion, six hundred sixty-one million, two hundred sixty-six thousand, four hundred seventy-four".