20954571511 has 8 divisors (see below), whose sum is σ = 21566482560. Its totient is φ = 20351218872.

The previous prime is 20954571497. The next prime is 20954571523. The reversal of 20954571511 is 11517545902.

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

It is a cyclic number.

It is not a de Polignac number, because 20954571511 - 2⁵ = 20954571479 is a prime.

It is a super-2 number, since 2×20954571511² (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 (20954571541) 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, 2134635 + ... + 2144428.

It is an arithmetic number, because the mean of its divisors is an integer number (2695810320).

Almost surely, 2^20954571511 is an apocalyptic number.

20954571511 is a deficient number, since it is larger than the sum of its proper divisors (611911049).

20954571511 is an equidigital number, since it uses as much as digits as its factorization.

20954571511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279205.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 20954571511 in words is "twenty billion, nine hundred fifty-four million, five hundred seventy-one thousand, five hundred eleven".