20355901 has 4 divisors (see below), whose sum is σ = 20368672. Its totient is φ = 20343132.

The previous prime is 20355893. The next prime is 20355917. The reversal of 20355901 is 10955302.

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 20355901 - 2³ = 20355893 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 (20355931) 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, 3585 + ... + 7318.

It is an arithmetic number, because the mean of its divisors is an integer number (5092168).

Almost surely, 2^20355901 is an apocalyptic number.

It is an amenable number.

20355901 is a deficient number, since it is larger than the sum of its proper divisors (12771).

20355901 is a wasteful number, since it uses less digits than its factorization.

20355901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12770.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20355901 is about 4511.7514337561. The cubic root of 20355901 is about 273.0424109040.

The spelling of 20355901 in words is "twenty million, three hundred fifty-five thousand, nine hundred one".