20473137 has 6 divisors (see below), whose sum is σ = 29572322. Its totient is φ = 13648752.

The previous prime is 20473129. The next prime is 20473139. The reversal of 20473137 is 73137402.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 6561 = 4524^2 + 81^2 .

It is not a de Polignac number, because 20473137 - 2³ = 20473129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20473137.

It is not an unprimeable number, because it can be changed into a prime (20473139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1137388 + ... + 1137405.

Almost surely, 2^20473137 is an apocalyptic number.

It is an amenable number.

20473137 is a deficient number, since it is larger than the sum of its proper divisors (9099185).

20473137 is a wasteful number, since it uses less digits than its factorization.

20473137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274799 (or 2274796 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20473137 is about 4524.7250745211. The cubic root of 20473137 is about 273.5655866869.

It can be divided in two parts, 2047 and 3137, that added together give a square (5184 = 72²).

The spelling of 20473137 in words is "twenty million, four hundred seventy-three thousand, one hundred thirty-seven".