20536215 has 32 divisors (see below), whose sum is σ = 37863936. Its totient is φ = 9310080.

The previous prime is 20536213. The next prime is 20536231. The reversal of 20536215 is 51263502.

It is not a de Polignac number, because 20536215 - 2¹ = 20536213 is a prime.

It is a super-2 number, since 2×20536215² = 843472253052450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20536213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13009 + ... + 14501.

It is an arithmetic number, because the mean of its divisors is an integer number (1183248).

Almost surely, 2^20536215 is an apocalyptic number.

20536215 is a deficient number, since it is larger than the sum of its proper divisors (17327721).

20536215 is a wasteful number, since it uses less digits than its factorization.

20536215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20536215 is about 4531.6900820775. The cubic root of 20536215 is about 273.8462516772.

Adding to 20536215 its reverse (51263502), we get a palindrome (71799717).

The spelling of 20536215 in words is "twenty million, five hundred thirty-six thousand, two hundred fifteen".