20413540221461 has 4 divisors (see below), whose sum is σ = 20414124953772. Its totient is φ = 20412955489152.

The previous prime is 20413540221449. The next prime is 20413540221493. The reversal of 20413540221461 is 16412204531402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12080532198436 + 8333008023025 = 3475706^2 + 2886695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413540221461 - 2¹⁴ = 20413540205077 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 (20413540226461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292313786 + ... + 292383611.

It is an arithmetic number, because the mean of its divisors is an integer number (5103531238443).

Almost surely, 2^{20413540221461} is an apocalyptic number.

It is an amenable number.

20413540221461 is a deficient number, since it is larger than the sum of its proper divisors (584732311).

20413540221461 is an equidigital number, since it uses as much as digits as its factorization.

20413540221461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584732310.

The product of its (nonzero) digits is 46080, while the sum is 35.

Adding to 20413540221461 its reverse (16412204531402), we get a palindrome (36825744752863).

The spelling of 20413540221461 in words is "twenty trillion, four hundred thirteen billion, five hundred forty million, two hundred twenty-one thousand, four hundred sixty-one".