20835091641 has 32 divisors (see below), whose sum is σ = 34200802048. Its totient is φ = 10986762240.

The previous prime is 20835091637. The next prime is 20835091663. The reversal of 20835091641 is 14619053802.

It is not a de Polignac number, because 20835091641 - 2² = 20835091637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 20835091641.

It is not an unprimeable number, because it can be changed into a prime (20835091621) 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 31 ways as a sum of consecutive naturals, for example, 1164201 + ... + 1181961.

It is an arithmetic number, because the mean of its divisors is an integer number (1068775064).

Almost surely, 2^20835091641 is an apocalyptic number.

20835091641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20835091641 is a deficient number, since it is larger than the sum of its proper divisors (13365710407).

20835091641 is a wasteful number, since it uses less digits than its factorization.

20835091641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22081.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 20835091641 in words is "twenty billion, eight hundred thirty-five million, ninety-one thousand, six hundred forty-one".