20105501 has 8 divisors (see below), whose sum is σ = 21690144. Its totient is φ = 18526320.

The previous prime is 20105483. The next prime is 20105507. The reversal of 20105501 is 10550102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20105501 - 2¹⁴ = 20089117 is a prime.

It is a super-2 number, since 2×20105501² = 808462340922002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9590 + ... + 11496.

It is an arithmetic number, because the mean of its divisors is an integer number (2711268).

Almost surely, 2^20105501 is an apocalyptic number.

It is an amenable number.

20105501 is a deficient number, since it is larger than the sum of its proper divisors (1584643).

20105501 is a wasteful number, since it uses less digits than its factorization.

20105501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 20105501 is about 4483.9158109849. The cubic root of 20105501 is about 271.9182144898.

Adding to 20105501 its reverse (10550102), we get a palindrome (30655603).

The spelling of 20105501 in words is "twenty million, one hundred five thousand, five hundred one".