20454121455 has 16 divisors (see below), whose sum is σ = 34651688544. Its totient is φ = 10267166720.

The previous prime is 20454121417. The next prime is 20454121463. The reversal of 20454121455 is 55412145402.

It is a happy number.

It is not a de Polignac number, because 20454121455 - 2⁸ = 20454121199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40105866 + ... + 40106375.

It is an arithmetic number, because the mean of its divisors is an integer number (2165730534).

Almost surely, 2^20454121455 is an apocalyptic number.

20454121455 is a deficient number, since it is larger than the sum of its proper divisors (14197567089).

20454121455 is a wasteful number, since it uses less digits than its factorization.

20454121455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80212266.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 20454121455 its reverse (55412145402), we get a palindrome (75866266857).

The spelling of 20454121455 in words is "twenty billion, four hundred fifty-four million, one hundred twenty-one thousand, four hundred fifty-five".