20433405553 has 4 divisors (see below), whose sum is σ = 22290987888. Its totient is φ = 18575823220.

The previous prime is 20433405541. The next prime is 20433405593. The reversal of 20433405553 is 35550433402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20433405553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20433405593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928791151 + ... + 928791172.

It is an arithmetic number, because the mean of its divisors is an integer number (5572746972).

Almost surely, 2^20433405553 is an apocalyptic number.

It is an amenable number.

20433405553 is a deficient number, since it is larger than the sum of its proper divisors (1857582335).

20433405553 is a wasteful number, since it uses less digits than its factorization.

20433405553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857582334.

The product of its (nonzero) digits is 108000, while the sum is 34.

Adding to 20433405553 its reverse (35550433402), we get a palindrome (55983838955).

The spelling of 20433405553 in words is "twenty billion, four hundred thirty-three million, four hundred five thousand, five hundred fifty-three".