20015288 has 8 divisors (see below), whose sum is σ = 37528680. Its totient is φ = 10007640.

The previous prime is 20015251. The next prime is 20015293. The reversal of 20015288 is 88251002.

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

It is a super-2 number, since 2×20015288² = 801223507445888, which contains 22 as substring.

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, 1250948 + ... + 1250963.

It is an arithmetic number, because the mean of its divisors is an integer number (4691085).

Almost surely, 2^20015288 is an apocalyptic number.

It is an amenable number.

20015288 is a deficient number, since it is larger than the sum of its proper divisors (17513392).

20015288 is a wasteful number, since it uses less digits than its factorization.

20015288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501917 (or 2501913 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 20015288 is about 4473.8448788486. The cubic root of 20015288 is about 271.5109074050.

The spelling of 20015288 in words is "twenty million, fifteen thousand, two hundred eighty-eight".