20010506905 has 8 divisors (see below), whose sum is σ = 24020746632. Its totient is φ = 16002979968.

The previous prime is 20010506861. The next prime is 20010506921. The reversal of 20010506905 is 50960501002.

It can be written as a sum of positive squares in 4 ways, for example, as 979752601 + 19030754304 = 31301^2 + 137952^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20010506905 - 2¹⁵ = 20010474137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661932 + ... + 691501.

It is an arithmetic number, because the mean of its divisors is an integer number (3002593329).

Almost surely, 2^20010506905 is an apocalyptic number.

It is an amenable number.

20010506905 is a deficient number, since it is larger than the sum of its proper divisors (4010239727).

20010506905 is a wasteful number, since it uses less digits than its factorization.

20010506905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356395.

The product of its (nonzero) digits is 2700, while the sum is 28.

The spelling of 20010506905 in words is "twenty billion, ten million, five hundred six thousand, nine hundred five".