20981226 has 32 divisors (see below), whose sum is σ = 48775680. Its totient is φ = 5892336.

The previous prime is 20981201. The next prime is 20981231. The reversal of 20981226 is 62218902.

It is a junction number, because it is equal to n+sod(n) for n = 20981193 and 20981202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (1524240).

Almost surely, 2^20981226 is an apocalyptic number.

20981226 is an abundant number, since it is smaller than the sum of its proper divisors (27794454).

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

20981226 is a wasteful number, since it uses less digits than its factorization.

20981226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20981226 is about 4580.5268255955. The cubic root of 20981226 is about 275.8101771851.

The spelling of 20981226 in words is "twenty million, nine hundred eighty-one thousand, two hundred twenty-six".