20581221734 has 8 divisors (see below), whose sum is σ = 32687822808. Its totient is φ = 9685280800.

The previous prime is 20581221719. The next prime is 20581221737. The reversal of 20581221734 is 43712218502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20581221694 and 20581221703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581221737) 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 3 ways as a sum of consecutive naturals, for example, 302664992 + ... + 302665059.

It is an arithmetic number, because the mean of its divisors is an integer number (4085977851).

Almost surely, 2^20581221734 is an apocalyptic number.

20581221734 is a deficient number, since it is larger than the sum of its proper divisors (12106601074).

20581221734 is a wasteful number, since it uses less digits than its factorization.

20581221734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605330070.

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 20581221734 in words is "twenty billion, five hundred eighty-one million, two hundred twenty-one thousand, seven hundred thirty-four".