20005534521 has 16 divisors (see below), whose sum is σ = 33871804800. Its totient is φ = 11431733904.

The previous prime is 20005534501. The next prime is 20005534541. The reversal of 20005534521 is 12543550002.

It is a happy number.

20005534521 is a `hidden beast` number, since 200 + 0 + 5 + 5 + 3 + 452 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (20005534501) and next prime (20005534541).

It is not a de Polignac number, because 20005534521 - 2¹⁵ = 20005501753 is a prime.

It is a super-2 number, since 2×20005534521² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20005534501) 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 15 ways as a sum of consecutive naturals, for example, 52924506 + ... + 52924883.

It is an arithmetic number, because the mean of its divisors is an integer number (2116987800).

Almost surely, 2^20005534521 is an apocalyptic number.

20005534521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20005534521 is a deficient number, since it is larger than the sum of its proper divisors (13866270279).

20005534521 is a wasteful number, since it uses less digits than its factorization.

20005534521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105849405 (or 105849399 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The spelling of 20005534521 in words is "twenty billion, five million, five hundred thirty-four thousand, five hundred twenty-one".