20265561101 has 4 divisors (see below), whose sum is σ = 21332169600. Its totient is φ = 19198952604.

The previous prime is 20265561091. The next prime is 20265561223. The reversal of 20265561101 is 10116556202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20265561101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20265569101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533304221 + ... + 533304258.

It is an arithmetic number, because the mean of its divisors is an integer number (5333042400).

Almost surely, 2^20265561101 is an apocalyptic number.

It is an amenable number.

20265561101 is a deficient number, since it is larger than the sum of its proper divisors (1066608499).

20265561101 is a wasteful number, since it uses less digits than its factorization.

20265561101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066608498.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 20265561101 in words is "twenty billion, two hundred sixty-five million, five hundred sixty-one thousand, one hundred one".