20402354554 has 4 divisors (see below), whose sum is σ = 30603531834. Its totient is φ = 10201177276.

The previous prime is 20402354549. The next prime is 20402354563. The reversal of 20402354554 is 45545320402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45545320402 = 2 ⋅22772660201.

It can be written as a sum of positive squares in only one way, i.e., 13707023929 + 6695330625 = 117077^2 + 81825^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100588637 + ... + 5100588640.

Almost surely, 2^20402354554 is an apocalyptic number.

20402354554 is a deficient number, since it is larger than the sum of its proper divisors (10201177280).

20402354554 is a wasteful number, since it uses less digits than its factorization.

20402354554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10201177279.

The product of its (nonzero) digits is 96000, while the sum is 34.

Adding to 20402354554 its reverse (45545320402), we get a palindrome (65947674956).

The spelling of 20402354554 in words is "twenty billion, four hundred two million, three hundred fifty-four thousand, five hundred fifty-four".