20928101 has 8 divisors (see below), whose sum is σ = 22075680. Its totient is φ = 19785168.

The previous prime is 20928079. The next prime is 20928107. The reversal of 20928101 is 10182902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20928101 is a prime.

It is a super-2 number, since 2×20928101² = 875970822932402, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20928107) 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, 12050 + ... + 13676.

It is an arithmetic number, because the mean of its divisors is an integer number (2759460).

Almost surely, 2^20928101 is an apocalyptic number.

It is an amenable number.

20928101 is a deficient number, since it is larger than the sum of its proper divisors (1147579).

20928101 is a wasteful number, since it uses less digits than its factorization.

20928101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20928101 is about 4574.7241446889. The cubic root of 20928101 is about 275.5771942976.

The spelling of 20928101 in words is "twenty million, nine hundred twenty-eight thousand, one hundred one".