20406631401 has 48 divisors (see below), whose sum is σ = 33459316800. Its totient is φ = 12351942720.

The previous prime is 20406631391. The next prime is 20406631403. The reversal of 20406631401 is 10413660402.

20406631401 is a `hidden beast` number, since 20 + 4 + 0 + 6 + 631 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 20406631401 - 2⁹ = 20406630889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20406631403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139750 + ... + 245648.

It is an arithmetic number, because the mean of its divisors is an integer number (697069100).

Almost surely, 2^20406631401 is an apocalyptic number.

It is an amenable number.

20406631401 is a deficient number, since it is larger than the sum of its proper divisors (13052685399).

20406631401 is a wasteful number, since it uses less digits than its factorization.

20406631401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105988 (or 105976 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 20406631401 in words is "twenty billion, four hundred six million, six hundred thirty-one thousand, four hundred one".