20424155406511 has 4 divisors (see below), whose sum is σ = 20622448177552. Its totient is φ = 20225862635472.

The previous prime is 20424155406481. The next prime is 20424155406527. The reversal of 20424155406511 is 11560455142402.

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 20424155406511 - 2⁹ = 20424155405999 is a prime.

It is a super-2 number, since 2×20424155406511² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424155406911) 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, 99146385366 + ... + 99146385571.

It is an arithmetic number, because the mean of its divisors is an integer number (5155612044388).

Almost surely, 2^{20424155406511} is an apocalyptic number.

20424155406511 is a deficient number, since it is larger than the sum of its proper divisors (198292771041).

20424155406511 is a wasteful number, since it uses less digits than its factorization.

20424155406511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198292771040.

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 20424155406511 in words is "twenty trillion, four hundred twenty-four billion, one hundred fifty-five million, four hundred six thousand, five hundred eleven".