20531554410 has 64 divisors (see below), whose sum is σ = 49984227072. Its totient is φ = 5396461056.

The previous prime is 20531554397. The next prime is 20531554411. The reversal of 20531554410 is 1445513502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20531554411) 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 31 ways as a sum of consecutive naturals, for example, 5335107 + ... + 5338953.

It is an arithmetic number, because the mean of its divisors is an integer number (781003548).

Almost surely, 2^20531554410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531554410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24992113536).

20531554410 is an abundant number, since it is smaller than the sum of its proper divisors (29452672662).

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

20531554410 is a wasteful number, since it uses less digits than its factorization.

20531554410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6367.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 20531554410 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-four thousand, four hundred ten".