20106561693 has 8 divisors (see below), whose sum is σ = 26809449856. Its totient is φ = 13404024000.

The previous prime is 20106561667. The next prime is 20106561733. The reversal of 20106561693 is 39616560102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20106561693 - 2⁵ = 20106561661 is a prime.

It is a super-2 number, since 2×20106561693² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20106561493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109788 + ... + 228618.

It is an arithmetic number, because the mean of its divisors is an integer number (3351181232).

Almost surely, 2^20106561693 is an apocalyptic number.

It is an amenable number.

20106561693 is a deficient number, since it is larger than the sum of its proper divisors (6702888163).

20106561693 is a wasteful number, since it uses less digits than its factorization.

20106561693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175235.

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 20106561693 in words is "twenty billion, one hundred six million, five hundred sixty-one thousand, six hundred ninety-three".