20533245451 has 4 divisors (see below), whose sum is σ = 21613942600. Its totient is φ = 19452548304.

The previous prime is 20533245449. The next prime is 20533245457. The reversal of 20533245451 is 15454233502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20533245451 - 2¹ = 20533245449 is a prime.

It is a super-2 number, since 2×20533245451² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20533245457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540348546 + ... + 540348583.

It is an arithmetic number, because the mean of its divisors is an integer number (5403485650).

Almost surely, 2^20533245451 is an apocalyptic number.

20533245451 is a deficient number, since it is larger than the sum of its proper divisors (1080697149).

20533245451 is a wasteful number, since it uses less digits than its factorization.

20533245451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080697148.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 20533245451 its reverse (15454233502), we get a palindrome (35987478953).

The spelling of 20533245451 in words is "twenty billion, five hundred thirty-three million, two hundred forty-five thousand, four hundred fifty-one".