20105401 has 4 divisors (see below), whose sum is σ = 21163600. Its totient is φ = 19047204.

The previous prime is 20105399. The next prime is 20105411. The reversal of 20105401 is 10450102.

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 20105401 - 2¹ = 20105399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20105411) 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, 529071 + ... + 529108.

It is an arithmetic number, because the mean of its divisors is an integer number (5290900).

Almost surely, 2^20105401 is an apocalyptic number.

It is an amenable number.

20105401 is a deficient number, since it is larger than the sum of its proper divisors (1058199).

20105401 is a wasteful number, since it uses less digits than its factorization.

20105401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058198.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20105401 is about 4483.9046600034. The cubic root of 20105401 is about 271.9177636701.

Adding to 20105401 its reverse (10450102), we get a palindrome (30555503).

The spelling of 20105401 in words is "twenty million, one hundred five thousand, four hundred one".