20424534451555 has 16 divisors (see below), whose sum is σ = 26398722478464. Its totient is φ = 15080481993600.

The previous prime is 20424534451523. The next prime is 20424534451579. The reversal of 20424534451555 is 55515443542402.

It is not a de Polignac number, because 20424534451555 - 2⁵ = 20424534451523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20424534451499 and 20424534451508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23010459 + ... + 23881588.

It is an arithmetic number, because the mean of its divisors is an integer number (1649920154904).

Almost surely, 2^{20424534451555} is an apocalyptic number.

20424534451555 is a deficient number, since it is larger than the sum of its proper divisors (5974188026909).

20424534451555 is a wasteful number, since it uses less digits than its factorization.

20424534451555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46898766.

The product of its (nonzero) digits is 9600000, while the sum is 49.

Adding to 20424534451555 its reverse (55515443542402), we get a palindrome (75939977993957).

The spelling of 20424534451555 in words is "twenty trillion, four hundred twenty-four billion, five hundred thirty-four million, four hundred fifty-one thousand, five hundred fifty-five".