20124764505 has 24 divisors (see below), whose sum is σ = 35060011272. Its totient is φ = 10678719744.

The previous prime is 20124764501. The next prime is 20124764531. The reversal of 20124764505 is 50546742102.

It is a happy number.

20124764505 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 4 + 7 + 645 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2042045721 + 18082718784 = 45189^2 + 134472^2 .

It is not a de Polignac number, because 20124764505 - 2² = 20124764501 is a prime.

It is a super-2 number, since 2×20124764505² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20124764505.

It is not an unprimeable number, because it can be changed into a prime (20124764501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1126204 + ... + 1143933.

It is an arithmetic number, because the mean of its divisors is an integer number (1460833803).

Almost surely, 2^20124764505 is an apocalyptic number.

It is an amenable number.

20124764505 is a deficient number, since it is larger than the sum of its proper divisors (14935246767).

20124764505 is a wasteful number, since it uses less digits than its factorization.

20124764505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270345 (or 2270342 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 20124764505 in words is "twenty billion, one hundred twenty-four million, seven hundred sixty-four thousand, five hundred five".