20971426 has 16 divisors (see below), whose sum is σ = 36357120. Its totient is φ = 8886240.

The previous prime is 20971409. The next prime is 20971427. The reversal of 20971426 is 62417902.

It is not an unprimeable number, because it can be changed into a prime (20971427) 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, 7170 + ... + 9661.

It is an arithmetic number, because the mean of its divisors is an integer number (2272320).

Almost surely, 2^20971426 is an apocalyptic number.

20971426 is a deficient number, since it is larger than the sum of its proper divisors (15385694).

20971426 is a wasteful number, since it uses less digits than its factorization.

20971426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16929.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20971426 is about 4579.4569547054. The cubic root of 20971426 is about 275.7672283019.

The spelling of 20971426 in words is "twenty million, nine hundred seventy-one thousand, four hundred twenty-six".