20388353554 has 4 divisors (see below), whose sum is σ = 30582530334. Its totient is φ = 10194176776.

The previous prime is 20388353543. The next prime is 20388353561. The reversal of 20388353554 is 45535388302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45535388302 = 2 ⋅22767694151.

It can be written as a sum of positive squares in only one way, i.e., 15568800625 + 4819552929 = 124775^2 + 69423^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5097088387 + ... + 5097088390.

Almost surely, 2^20388353554 is an apocalyptic number.

20388353554 is a deficient number, since it is larger than the sum of its proper divisors (10194176780).

20388353554 is a wasteful number, since it uses less digits than its factorization.

20388353554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10194176779.

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 20388353554 in words is "twenty billion, three hundred eighty-eight million, three hundred fifty-three thousand, five hundred fifty-four".