20828113 has 4 divisors (see below), whose sum is σ = 21091840. Its totient is φ = 20564388.

The previous prime is 20828107. The next prime is 20828147. The reversal of 20828113 is 31182802.

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 20828113 - 2¹³ = 20819921 is a prime.

It is a super-2 number, since 2×20828113² = 867620582281538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20828153) 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, 131745 + ... + 131902.

It is an arithmetic number, because the mean of its divisors is an integer number (5272960).

Almost surely, 2^20828113 is an apocalyptic number.

It is an amenable number.

20828113 is a deficient number, since it is larger than the sum of its proper divisors (263727).

20828113 is an equidigital number, since it uses as much as digits as its factorization.

20828113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263726.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20828113 is about 4563.7827511835. The cubic root of 20828113 is about 275.1376192735.

The spelling of 20828113 in words is "twenty million, eight hundred twenty-eight thousand, one hundred thirteen".