20581402619 has 4 divisors (see below), whose sum is σ = 20582295840. Its totient is φ = 20580509400.

The previous prime is 20581402607. The next prime is 20581402627. The reversal of 20581402619 is 91620418502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20581402619 - 2²⁰ = 20580354043 is a prime.

It is a super-2 number, since 2×20581402619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20581401619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411107 + ... + 458444.

It is an arithmetic number, because the mean of its divisors is an integer number (5145573960).

Almost surely, 2^20581402619 is an apocalyptic number.

20581402619 is a deficient number, since it is larger than the sum of its proper divisors (893221).

20581402619 is an equidigital number, since it uses as much as digits as its factorization.

20581402619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893220.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 20581402619 in words is "twenty billion, five hundred eighty-one million, four hundred two thousand, six hundred nineteen".