20699426 has 16 divisors (see below), whose sum is σ = 34661088. Its totient is φ = 9189600.

The previous prime is 20699423. The next prime is 20699431. The reversal of 20699426 is 62499602.

It is a self number, because there is not a number n which added to its sum of digits gives 20699426.

It is not an unprimeable number, because it can be changed into a prime (20699423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9995 + ... + 11886.

It is an arithmetic number, because the mean of its divisors is an integer number (2166318).

Almost surely, 2^20699426 is an apocalyptic number.

20699426 is a deficient number, since it is larger than the sum of its proper divisors (13961662).

20699426 is a wasteful number, since it uses less digits than its factorization.

20699426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21937.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20699426 is about 4549.6621852617. The cubic root of 20699426 is about 274.5698000892.

The spelling of 20699426 in words is "twenty million, six hundred ninety-nine thousand, four hundred twenty-six".