20403428 has 24 divisors (see below), whose sum is σ = 37107000. Its totient is φ = 9808128.

The previous prime is 20403419. The next prime is 20403431. The reversal of 20403428 is 82430402.

It can be written as a sum of positive squares in 4 ways, for example, as 2696164 + 17707264 = 1642^2 + 4208^2 .

It is an unprimeable number.

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, 12398 + ... + 13946.

It is an arithmetic number, because the mean of its divisors is an integer number (1546125).

Almost surely, 2^20403428 is an apocalyptic number.

It is an amenable number.

20403428 is a deficient number, since it is larger than the sum of its proper divisors (16703572).

20403428 is a wasteful number, since it uses less digits than its factorization.

20403428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20403428 is about 4517.0153862921. The cubic root of 20403428 is about 273.2547457327.

The spelling of 20403428 in words is "twenty million, four hundred three thousand, four hundred twenty-eight".