20417428 has 6 divisors (see below), whose sum is σ = 35730506. Its totient is φ = 10208712.

The previous prime is 20417417. The next prime is 20417429. The reversal of 20417428 is 82471402.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 898704 = 4418^2 + 948^2 .

It is a super-2 number, since 2×20417428² = 833742732270368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20417396 and 20417405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20417429) 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 as a sum of consecutive naturals, namely, 2552175 + ... + 2552182.

Almost surely, 2^20417428 is an apocalyptic number.

It is an amenable number.

20417428 is a deficient number, since it is larger than the sum of its proper divisors (15313078).

20417428 is a wasteful number, since it uses less digits than its factorization.

20417428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104361 (or 5104359 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20417428 is about 4518.5648163991. The cubic root of 20417428 is about 273.3172301968.

The spelling of 20417428 in words is "twenty million, four hundred seventeen thousand, four hundred twenty-eight".