20444155713405 has 12 divisors (see below), whose sum is σ = 35436536569980. Its totient is φ = 10903549713792.

The previous prime is 20444155713403. The next prime is 20444155713431. The reversal of 20444155713405 is 50431755144402.

It is a happy number.

20444155713405 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 41 + 5 + 571 + 34 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5529745074681 + 14914410638724 = 2351541^2 + 3861918^2 .

It is not a de Polignac number, because 20444155713405 - 2¹ = 20444155713403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 454314571409 = 20444155713405 / (2 + 0 + 4 + 4 + 4 + 1 + 5 + 5 + 7 + 1 + 3 + 4 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444155713403) 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, 227157285660 + ... + 227157285749.

It is an arithmetic number, because the mean of its divisors is an integer number (2953044714165).

Almost surely, 2^{20444155713405} is an apocalyptic number.

It is an amenable number.

20444155713405 is a deficient number, since it is larger than the sum of its proper divisors (14992380856575).

20444155713405 is a wasteful number, since it uses less digits than its factorization.

20444155713405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454314571420 (or 454314571417 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 45.

The spelling of 20444155713405 in words is "twenty trillion, four hundred forty-four billion, one hundred fifty-five million, seven hundred thirteen thousand, four hundred five".