20305226767661 has 16 divisors (see below), whose sum is σ = 22204744684800. Its totient is φ = 18414644068800.

The previous prime is 20305226767649. The next prime is 20305226767669. The reversal of 20305226767661 is 16676762250302.

It is a cyclic number.

It is not a de Polignac number, because 20305226767661 - 2¹⁰ = 20305226766637 is a prime.

It is a super-2 number, since 2×20305226767661² (a number of 27 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 (20305226767669) 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, 122541455 + ... + 122707043.

It is an arithmetic number, because the mean of its divisors is an integer number (1387796542800).

Almost surely, 2^{20305226767661} is an apocalyptic number.

It is an amenable number.

20305226767661 is a deficient number, since it is larger than the sum of its proper divisors (1899517917139).

20305226767661 is a wasteful number, since it uses less digits than its factorization.

20305226767661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192500.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 20305226767661 in words is "twenty trillion, three hundred five billion, two hundred twenty-six million, seven hundred sixty-seven thousand, six hundred sixty-one".