20854233569 has 4 divisors (see below), whose sum is σ = 22458405396. Its totient is φ = 19250061744.

The previous prime is 20854233527. The next prime is 20854233581. The reversal of 20854233569 is 96533245802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7551610000 + 13302623569 = 86900^2 + 115337^2 .

It is a cyclic number.

It is not a de Polignac number, because 20854233569 - 2¹⁶ = 20854168033 is a prime.

It is a super-2 number, since 2×20854233569² (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 (20854233509) 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, 802085894 + ... + 802085919.

It is an arithmetic number, because the mean of its divisors is an integer number (5614601349).

Almost surely, 2^20854233569 is an apocalyptic number.

It is an amenable number.

20854233569 is a deficient number, since it is larger than the sum of its proper divisors (1604171827).

20854233569 is a wasteful number, since it uses less digits than its factorization.

20854233569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604171826.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 20854233569 in words is "twenty billion, eight hundred fifty-four million, two hundred thirty-three thousand, five hundred sixty-nine".