20401161606 has 32 divisors (see below), whose sum is σ = 51812474880. Its totient is φ = 5828903208.

The previous prime is 20401161601. The next prime is 20401161623. The reversal of 20401161606 is 60616110402.

20401161606 is a `hidden beast` number, since 2 + 0 + 40 + 1 + 1 + 616 + 0 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20401161606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401161601) 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, 26985286 + ... + 26986041.

It is an arithmetic number, because the mean of its divisors is an integer number (1619139840).

Almost surely, 2^20401161606 is an apocalyptic number.

20401161606 is an abundant number, since it is smaller than the sum of its proper divisors (31411313274).

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

20401161606 is a wasteful number, since it uses less digits than its factorization.

20401161606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53971345 (or 53971339 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 20401161606 in words is "twenty billion, four hundred one million, one hundred sixty-one thousand, six hundred six".