1020203203554 has 12 divisors (see below), whose sum is σ = 2210440274406. Its totient is φ = 340067734512.

The previous prime is 1020203203511. The next prime is 1020203203559. The reversal of 1020203203554 is 4553023020201.

It is a happy number.

1020203203554 is a `hidden beast` number, since 102 + 0 + 2 + 0 + 3 + 2 + 0 + 3 + 554 = 666.

It can be written as a sum of positive squares in only one way, i.e., 813291937929 + 206911265625 = 901827^2 + 454875^2 .

It is not an unprimeable number, because it can be changed into a prime (1020203203559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28338977859 + ... + 28338977894.

Almost surely, 2^{1020203203554} is an apocalyptic number.

1020203203554 is an abundant number, since it is smaller than the sum of its proper divisors (1190237070852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020203203554 is a wasteful number, since it uses less digits than its factorization.

1020203203554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56677955761 (or 56677955758 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 1020203203554 its reverse (4553023020201), we get a palindrome (5573226223755).

The spelling of 1020203203554 in words is "one trillion, twenty billion, two hundred three million, two hundred three thousand, five hundred fifty-four".