20145443553 has 16 divisors (see below), whose sum is σ = 30334368000. Its totient is φ = 13210125840.

The previous prime is 20145443497. The next prime is 20145443567. The reversal of 20145443553 is 35534454102.

20145443553 is a `hidden beast` number, since 2 + 0 + 14 + 54 + 43 + 553 = 666.

It is not a de Polignac number, because 20145443553 - 2²⁸ = 19877008097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20145443053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6114153 + ... + 6117446.

It is an arithmetic number, because the mean of its divisors is an integer number (1895898000).

Almost surely, 2^20145443553 is an apocalyptic number.

It is an amenable number.

20145443553 is a deficient number, since it is larger than the sum of its proper divisors (10188924447).

20145443553 is a wasteful number, since it uses less digits than its factorization.

20145443553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12231669 (or 12231663 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 20145443553 its reverse (35534454102), we get a palindrome (55679897655).

The spelling of 20145443553 in words is "twenty billion, one hundred forty-five million, four hundred forty-three thousand, five hundred fifty-three".