20415520404663 has 4 divisors (see below), whose sum is σ = 27220693872888. Its totient is φ = 13610346936440.

The previous prime is 20415520404647. The next prime is 20415520404703. The reversal of 20415520404663 is 36640402551402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20415520404663 - 2⁴ = 20415520404647 is a prime.

It is a super-2 number, since 2×20415520404663² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415530404663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402586734108 + ... + 3402586734113.

It is an arithmetic number, because the mean of its divisors is an integer number (6805173468222).

Almost surely, 2^{20415520404663} is an apocalyptic number.

20415520404663 is a deficient number, since it is larger than the sum of its proper divisors (6805173468225).

20415520404663 is an equidigital number, since it uses as much as digits as its factorization.

20415520404663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805173468224.

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 20415520404663 in words is "twenty trillion, four hundred fifteen billion, five hundred twenty million, four hundred four thousand, six hundred sixty-three".