20126497473 has 6 divisors (see below), whose sum is σ = 29071607474. Its totient is φ = 13417664976.

The previous prime is 20126497463. The next prime is 20126497477. The reversal of 20126497473 is 37479462102.

20126497473 is a `hidden beast` number, since 20 + 12 + 64 + 97 + 473 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19628850609 + 497646864 = 140103^2 + 22308^2 .

It is not a de Polignac number, because 20126497473 - 2⁶ = 20126497409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20126497477) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1118138740 + ... + 1118138757.

Almost surely, 2^20126497473 is an apocalyptic number.

It is an amenable number.

20126497473 is a deficient number, since it is larger than the sum of its proper divisors (8945110001).

20126497473 is a wasteful number, since it uses less digits than its factorization.

20126497473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236277503 (or 2236277500 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20126497473 in words is "twenty billion, one hundred twenty-six million, four hundred ninety-seven thousand, four hundred seventy-three".