20261616571 has 12 divisors (see below), whose sum is σ = 23571961032. Its totient is φ = 17365386528.

The previous prime is 20261616457. The next prime is 20261616577. The reversal of 20261616571 is 17561616202.

It is a happy number.

It is not a de Polignac number, because 20261616571 - 2⁷ = 20261616443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20261616571.

It is not an unprimeable number, because it can be changed into a prime (20261616577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 909856 + ... + 931858.

It is an arithmetic number, because the mean of its divisors is an integer number (1964330086).

Almost surely, 2^20261616571 is an apocalyptic number.

20261616571 is a deficient number, since it is larger than the sum of its proper divisors (3310344461).

20261616571 is a wasteful number, since it uses less digits than its factorization.

20261616571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40810 (or 40803 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 20261616571 in words is "twenty billion, two hundred sixty-one million, six hundred sixteen thousand, five hundred seventy-one".