20406667401 has 12 divisors (see below), whose sum is σ = 29737151028. Its totient is φ = 13484050944.

The previous prime is 20406667381. The next prime is 20406667447. The reversal of 20406667401 is 10476660402.

It can be written as a sum of positive squares in 2 ways, for example, as 9517953600 + 10888713801 = 97560^2 + 104349^2 .

It is not a de Polignac number, because 20406667401 - 2²² = 20402473097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20406667201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10031760 + ... + 10033793.

It is an arithmetic number, because the mean of its divisors is an integer number (2478095919).

Almost surely, 2^20406667401 is an apocalyptic number.

It is an amenable number.

20406667401 is a deficient number, since it is larger than the sum of its proper divisors (9330483627).

20406667401 is a wasteful number, since it uses less digits than its factorization.

20406667401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20065672 (or 20065669 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 20406667401 in words is "twenty billion, four hundred six million, six hundred sixty-seven thousand, four hundred one".