20405481237 has 12 divisors (see below), whose sum is σ = 29495228620. Its totient is φ = 13594125888.

The previous prime is 20405481227. The next prime is 20405481247. The reversal of 20405481237 is 73218450402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20405481227) and next prime (20405481247).

It can be written as a sum of positive squares in 2 ways, for example, as 8384332356 + 12021148881 = 91566^2 + 109641^2 .

It is not a de Polignac number, because 20405481237 - 2⁴ = 20405481221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405481227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 780448 + ... + 806169.

Almost surely, 2^20405481237 is an apocalyptic number.

It is an amenable number.

20405481237 is a deficient number, since it is larger than the sum of its proper divisors (9089747383).

20405481237 is a wasteful number, since it uses less digits than its factorization.

20405481237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588052 (or 1588049 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 20405481237 in words is "twenty billion, four hundred five million, four hundred eighty-one thousand, two hundred thirty-seven".