20423647545 has 64 divisors (see below), whose sum is σ = 38301548544. Its totient is φ = 9098196480.

The previous prime is 20423647537. The next prime is 20423647613. The reversal of 20423647545 is 54574632402.

It is not a de Polignac number, because 20423647545 - 2³ = 20423647537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20423647497 and 20423647506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4573984 + ... + 4578446.

It is an arithmetic number, because the mean of its divisors is an integer number (598461696).

Almost surely, 2^20423647545 is an apocalyptic number.

It is an amenable number.

20423647545 is a deficient number, since it is larger than the sum of its proper divisors (17877900999).

20423647545 is a wasteful number, since it uses less digits than its factorization.

20423647545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582.

The product of its (nonzero) digits is 806400, while the sum is 42.

The spelling of 20423647545 in words is "twenty billion, four hundred twenty-three million, six hundred forty-seven thousand, five hundred forty-five".