20364241821 has 16 divisors (see below), whose sum is σ = 33852246528. Its totient is φ = 10578826800.

The previous prime is 20364241801. The next prime is 20364241829. The reversal of 20364241821 is 12814246302.

It is not a de Polignac number, because 20364241821 - 2⁹ = 20364241309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20364241829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44078215 + ... + 44078676.

It is an arithmetic number, because the mean of its divisors is an integer number (2115765408).

Almost surely, 2^20364241821 is an apocalyptic number.

20364241821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20364241821 is a deficient number, since it is larger than the sum of its proper divisors (13488004707).

20364241821 is a wasteful number, since it uses less digits than its factorization.

20364241821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88156912.

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 20364241821 in words is "twenty billion, three hundred sixty-four million, two hundred forty-one thousand, eight hundred twenty-one".