20906291869 has 16 divisors (see below), whose sum is σ = 22350278080. Its totient is φ = 19497075840.

The previous prime is 20906291849. The next prime is 20906291881. The reversal of 20906291869 is 96819260902.

It is a cyclic number.

It is not a de Polignac number, because 20906291869 - 2¹³ = 20906283677 is a prime.

It is a super-2 number, since 2×20906291869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906291839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2211577 + ... + 2221009.

It is an arithmetic number, because the mean of its divisors is an integer number (1396892380).

Almost surely, 2^20906291869 is an apocalyptic number.

It is an amenable number.

20906291869 is a deficient number, since it is larger than the sum of its proper divisors (1443986211).

20906291869 is a wasteful number, since it uses less digits than its factorization.

20906291869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11260.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 20906291869 in words is "twenty billion, nine hundred six million, two hundred ninety-one thousand, eight hundred sixty-nine".