20367235621 has 4 divisors (see below), whose sum is σ = 20442391744. Its totient is φ = 20292079500.

The previous prime is 20367235619. The next prime is 20367235639. The reversal of 20367235621 is 12653276302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20367235621 - 2¹ = 20367235619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20367235121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37577655 + ... + 37578196.

It is an arithmetic number, because the mean of its divisors is an integer number (5110597936).

Almost surely, 2^20367235621 is an apocalyptic number.

It is an amenable number.

20367235621 is a deficient number, since it is larger than the sum of its proper divisors (75156123).

20367235621 is an equidigital number, since it uses as much as digits as its factorization.

20367235621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75156122.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 20367235621 in words is "twenty billion, three hundred sixty-seven million, two hundred thirty-five thousand, six hundred twenty-one".