20345520413403 has 40 divisors (see below), whose sum is σ = 32451649959168. Its totient is φ = 12672235111536.

The previous prime is 20345520413381. The next prime is 20345520413417. The reversal of 20345520413403 is 30431402554302.

20345520413403 is a `hidden beast` number, since 2 + 0 + 3 + 45 + 5 + 204 + 1 + 3 + 403 = 666.

It is not a de Polignac number, because 20345520413403 - 2⁵ = 20345520413371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20345520413443) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 126906375 + ... + 127066592.

Almost surely, 2^{20345520413403} is an apocalyptic number.

20345520413403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20345520413403 is a deficient number, since it is larger than the sum of its proper divisors (12106129545765).

20345520413403 is a wasteful number, since it uses less digits than its factorization.

20345520413403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253973045 (or 253973036 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 20345520413403 its reverse (30431402554302), we get a palindrome (50776922967705).

The spelling of 20345520413403 in words is "twenty trillion, three hundred forty-five billion, five hundred twenty million, four hundred thirteen thousand, four hundred three".