20406137641 has 8 divisors (see below), whose sum is σ = 20621146280. Its totient is φ = 20191223808.

The previous prime is 20406137639. The next prime is 20406137699. The reversal of 20406137641 is 14673160402.

It can be written as a sum of positive squares in 4 ways, for example, as 2870816400 + 17535321241 = 53580^2 + 132421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20406137641 - 2¹ = 20406137639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20406137597 and 20406137606.

It is not an unprimeable number, because it can be changed into a prime (20406137041) 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, 460825 + ... + 503161.

It is an arithmetic number, because the mean of its divisors is an integer number (2577643285).

Almost surely, 2^20406137641 is an apocalyptic number.

It is an amenable number.

20406137641 is a deficient number, since it is larger than the sum of its proper divisors (215008639).

20406137641 is an equidigital number, since it uses as much as digits as its factorization.

20406137641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47403.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 20406137641 in words is "twenty billion, four hundred six million, one hundred thirty-seven thousand, six hundred forty-one".