20515250 has 64 divisors (see below), whose sum is σ = 46275840. Its totient is φ = 6652800.

The previous prime is 20515249. The next prime is 20515283. The reversal of 20515250 is 5251502.

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 31 ways as a sum of consecutive naturals, for example, 32942 + ... + 33558.

It is an arithmetic number, because the mean of its divisors is an integer number (723060).

Almost surely, 2^20515250 is an apocalyptic number.

20515250 is an abundant number, since it is smaller than the sum of its proper divisors (25760590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20515250 is a wasteful number, since it uses less digits than its factorization.

20515250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 650 counting only the distinct ones).

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

The square root of 20515250 is about 4529.3763367598. The cubic root of 20515250 is about 273.7530319438.

Adding to 20515250 its reverse (5251502), we get a palindrome (25766752).

It can be divided in two parts, 205 and 15250, that multiplied together give a triangular number (3126250 = T₂₅₀₀).

The spelling of 20515250 in words is "twenty million, five hundred fifteen thousand, two hundred fifty".