20424505667 has 4 divisors (see below), whose sum is σ = 20580418056. Its totient is φ = 20268593280.

The previous prime is 20424505583. The next prime is 20424505669. The reversal of 20424505667 is 76650542402.

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 20424505667 - 2¹⁸ = 20424243523 is a prime.

It is a super-2 number, since 2×20424505667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20424505669) 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, 77955998 + ... + 77956259.

It is an arithmetic number, because the mean of its divisors is an integer number (5145104514).

Almost surely, 2^20424505667 is an apocalyptic number.

20424505667 is a deficient number, since it is larger than the sum of its proper divisors (155912389).

20424505667 is a wasteful number, since it uses less digits than its factorization.

20424505667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155912388.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20424505667 in words is "twenty billion, four hundred twenty-four million, five hundred five thousand, six hundred sixty-seven".