20409835601 has 4 divisors (see below), whose sum is σ = 20410122804. Its totient is φ = 20409548400.

The previous prime is 20409835573. The next prime is 20409835631. The reversal of 20409835601 is 10653890402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18096706576 + 2313129025 = 134524^2 + 48095^2 .

It is a cyclic number.

It is not a de Polignac number, because 20409835601 - 2²⁶ = 20342726737 is a prime.

It is a super-2 number, since 2×20409835601² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20409835631) 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 3 ways as a sum of consecutive naturals, for example, 49991 + ... + 208131.

It is an arithmetic number, because the mean of its divisors is an integer number (5102530701).

Almost surely, 2^20409835601 is an apocalyptic number.

It is an amenable number.

20409835601 is a deficient number, since it is larger than the sum of its proper divisors (287203).

20409835601 is a wasteful number, since it uses less digits than its factorization.

20409835601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287202.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 20409835601 in words is "twenty billion, four hundred nine million, eight hundred thirty-five thousand, six hundred one".