20019256 has 8 divisors (see below), whose sum is σ = 37536120. Its totient is φ = 10009624.

The previous prime is 20019247. The next prime is 20019271. The reversal of 20019256 is 65291002.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20019256² = 801541221587072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20019256.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1251196 + ... + 1251211.

It is an arithmetic number, because the mean of its divisors is an integer number (4692015).

Almost surely, 2^20019256 is an apocalyptic number.

It is an amenable number.

20019256 is a deficient number, since it is larger than the sum of its proper divisors (17516864).

20019256 is a wasteful number, since it uses less digits than its factorization.

20019256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502413 (or 2502409 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20019256 is about 4474.2883232979. The cubic root of 20019256 is about 271.5288484258.

The spelling of 20019256 in words is "twenty million, nineteen thousand, two hundred fifty-six".