20152505 has 16 divisors (see below), whose sum is σ = 24718080. Its totient is φ = 15769728.

The previous prime is 20152493. The next prime is 20152523. The reversal of 20152505 is 50525102.

It is a cyclic number.

It is not a de Polignac number, because 20152505 - 2⁶ = 20152441 is a prime.

It is a super-2 number, since 2×20152505² = 812246915550050, which contains 22 as substring.

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 in 15 ways as a sum of consecutive naturals, for example, 64229 + ... + 64541.

It is an arithmetic number, because the mean of its divisors is an integer number (1544880).

Almost surely, 2^20152505 is an apocalyptic number.

It is an amenable number.

20152505 is a deficient number, since it is larger than the sum of its proper divisors (4565575).

20152505 is a wasteful number, since it uses less digits than its factorization.

20152505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20152505 is about 4489.1541519533. The cubic root of 20152505 is about 272.1299525009.

Adding to 20152505 its reverse (50525102), we get a palindrome (70677607).

The spelling of 20152505 in words is "twenty million, one hundred fifty-two thousand, five hundred five".