20813826 has 16 divisors (see below), whose sum is σ = 45412128. Its totient is φ = 6307200.

The previous prime is 20813813. The next prime is 20813839. The reversal of 20813826 is 62831802.

It is an interprime number because it is at equal distance from previous prime (20813813) and next prime (20813839).

It is a junction number, because it is equal to n+sod(n) for n = 20813793 and 20813802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157615 + ... + 157746.

It is an arithmetic number, because the mean of its divisors is an integer number (2838258).

Almost surely, 2^20813826 is an apocalyptic number.

20813826 is an abundant number, since it is smaller than the sum of its proper divisors (24598302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20813826 is a wasteful number, since it uses less digits than its factorization.

20813826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315377.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20813826 is about 4562.2172241137. The cubic root of 20813826 is about 275.0746948612.

The spelling of 20813826 in words is "twenty million, eight hundred thirteen thousand, eight hundred twenty-six".