20400201306 has 24 divisors (see below), whose sum is σ = 44341663860. Its totient is φ = 6778339776.

The previous prime is 20400201301. The next prime is 20400201307. The reversal of 20400201306 is 60310200402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15533883225 + 4866318081 = 124635^2 + 69759^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20400201301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1804821 + ... + 1816088.

Almost surely, 2^20400201306 is an apocalyptic number.

20400201306 is an abundant number, since it is smaller than the sum of its proper divisors (23941462554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400201306 is a wasteful number, since it uses less digits than its factorization.

20400201306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3621230 (or 3621227 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20400201306 its reverse (60310200402), we get a palindrome (80710401708).

The spelling of 20400201306 in words is "twenty billion, four hundred million, two hundred one thousand, three hundred six".