20581481535 has 16 divisors (see below), whose sum is σ = 32937644256. Its totient is φ = 10974365568.

The previous prime is 20581481533. The next prime is 20581481551. The reversal of 20581481535 is 53518418502.

It is not a de Polignac number, because 20581481535 - 2¹ = 20581481533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581481533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80284 + ... + 218193.

It is an arithmetic number, because the mean of its divisors is an integer number (2058602766).

Almost surely, 2^20581481535 is an apocalyptic number.

20581481535 is a deficient number, since it is larger than the sum of its proper divisors (12356162721).

20581481535 is a wasteful number, since it uses less digits than its factorization.

20581481535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303082.

The product of its (nonzero) digits is 192000, while the sum is 42.

The spelling of 20581481535 in words is "twenty billion, five hundred eighty-one million, four hundred eighty-one thousand, five hundred thirty-five".