20439747211 has 16 divisors (see below), whose sum is σ = 23235206400. Its totient is φ = 17824567968.

The previous prime is 20439747197. The next prime is 20439747257. The reversal of 20439747211 is 11274793402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20439747211 - 2¹⁵ = 20439714443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20439747281) 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, 26581 + ... + 203926.

It is an arithmetic number, because the mean of its divisors is an integer number (1452200400).

Almost surely, 2^20439747211 is an apocalyptic number.

20439747211 is a deficient number, since it is larger than the sum of its proper divisors (2795459189).

20439747211 is a wasteful number, since it uses less digits than its factorization.

20439747211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230898.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 20439747211 in words is "twenty billion, four hundred thirty-nine million, seven hundred forty-seven thousand, two hundred eleven".