20812541761 has 8 divisors (see below), whose sum is σ = 23024374848. Its totient is φ = 18654006000.

The previous prime is 20812541753. The next prime is 20812541807. The reversal of 20812541761 is 16714521802.

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 20812541761 - 2³ = 20812541753 is a prime.

It is a super-2 number, since 2×20812541761² (a number of 21 digits) contains 22 as substring.

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 20812541761.

It is not an unprimeable number, because it can be changed into a prime (20812544761) 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, 13323510 + ... + 13325071.

It is an arithmetic number, because the mean of its divisors is an integer number (2878046856).

Almost surely, 2^20812541761 is an apocalyptic number.

It is an amenable number.

20812541761 is a deficient number, since it is larger than the sum of its proper divisors (2211833087).

20812541761 is a wasteful number, since it uses less digits than its factorization.

20812541761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26648663.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 20812541761 in words is "twenty billion, eight hundred twelve million, five hundred forty-one thousand, seven hundred sixty-one".