20928131 has 8 divisors (see below), whose sum is σ = 24689664. Its totient is φ = 17359560.

The previous prime is 20928107. The next prime is 20928157. The reversal of 20928131 is 13182902.

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 20928131 - 2¹⁰ = 20927107 is a prime.

It is a super-2 number, since 2×20928131² = 875973334306322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20928131.

It is not an unprimeable number, because it can be changed into a prime (20928191) 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, 48005 + ... + 48438.

It is an arithmetic number, because the mean of its divisors is an integer number (3086208).

Almost surely, 2^20928131 is an apocalyptic number.

20928131 is a deficient number, since it is larger than the sum of its proper divisors (3761533).

20928131 is an equidigital number, since it uses as much as digits as its factorization.

20928131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96481.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20928131 is about 4574.7274235740. The cubic root of 20928131 is about 275.5773259756.

The spelling of 20928131 in words is "twenty million, nine hundred twenty-eight thousand, one hundred thirty-one".