20428394 has 32 divisors (see below), whose sum is σ = 36220800. Its totient is φ = 8636544.

The previous prime is 20428391. The next prime is 20428399. The reversal of 20428394 is 49382402.

It is a self number, because there is not a number n which added to its sum of digits gives 20428394.

It is not an unprimeable number, because it can be changed into a prime (20428391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66389 + ... + 66695.

It is an arithmetic number, because the mean of its divisors is an integer number (1131900).

Almost surely, 2^20428394 is an apocalyptic number.

20428394 is a deficient number, since it is larger than the sum of its proper divisors (15792406).

20428394 is an equidigital number, since it uses as much as digits as its factorization.

20428394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20428394 is about 4519.7780918979. The cubic root of 20428394 is about 273.3661534389.

The spelling of 20428394 in words is "twenty million, four hundred twenty-eight thousand, three hundred ninety-four".