20533242455 has 16 divisors (see below), whose sum is σ = 26884579104. Its totient is φ = 14930657280.

The previous prime is 20533242451. The next prime is 20533242467. The reversal of 20533242455 is 55424233502.

It is not a de Polignac number, because 20533242455 - 2² = 20533242451 is a prime.

It is a super-2 number, since 2×20533242455² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533242451) 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, 319079 + ... + 377991.

It is an arithmetic number, because the mean of its divisors is an integer number (1680286194).

Almost surely, 2^20533242455 is an apocalyptic number.

20533242455 is a deficient number, since it is larger than the sum of its proper divisors (6351336649).

20533242455 is a wasteful number, since it uses less digits than its factorization.

20533242455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65266.

The product of its (nonzero) digits is 144000, while the sum is 35.

Adding to 20533242455 its reverse (55424233502), we get a palindrome (75957475957).

The spelling of 20533242455 in words is "twenty billion, five hundred thirty-three million, two hundred forty-two thousand, four hundred fifty-five".