20520353454 has 16 divisors (see below), whose sum is σ = 41043152640. Its totient is φ = 6839710200.

The previous prime is 20520353449. The next prime is 20520353461. The reversal of 20520353454 is 45435302502.

It is a happy number.

It is a super-3 number, since 3×20520353454³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18027 + ... + 203385.

It is an arithmetic number, because the mean of its divisors is an integer number (2565197040).

Almost surely, 2^20520353454 is an apocalyptic number.

20520353454 is an abundant number, since it is smaller than the sum of its proper divisors (20522799186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20520353454 is a wasteful number, since it uses less digits than its factorization.

20520353454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203815.

The product of its (nonzero) digits is 72000, while the sum is 33.

Adding to 20520353454 its reverse (45435302502), we get a palindrome (65955655956).

The spelling of 20520353454 in words is "twenty billion, five hundred twenty million, three hundred fifty-three thousand, four hundred fifty-four".