20400201305 has 24 divisors (see below), whose sum is σ = 27210443400. Its totient is φ = 14669768960.

The previous prime is 20400201301. The next prime is 20400201307. The reversal of 20400201305 is 50310200402.

It can be written as a sum of positive squares in 4 ways, for example, as 4648336 + 20395552969 = 2156^2 + 142813^2 .

It is not a de Polignac number, because 20400201305 - 2² = 20400201301 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 135590 + ... + 243279.

It is an arithmetic number, because the mean of its divisors is an integer number (1133768475).

Almost surely, 2^20400201305 is an apocalyptic number.

It is an amenable number.

20400201305 is a deficient number, since it is larger than the sum of its proper divisors (6810242095).

20400201305 is a wasteful number, since it uses less digits than its factorization.

20400201305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378985 (or 378974 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 20400201305 its reverse (50310200402), we get a palindrome (70710401707).

The spelling of 20400201305 in words is "twenty billion, four hundred million, two hundred one thousand, three hundred five".