20652985 has 8 divisors (see below), whose sum is σ = 25029576. Its totient is φ = 16358400.

The previous prime is 20652967. The next prime is 20653001. The reversal of 20652985 is 58925602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11215801 + 9437184 = 3349^2 + 3072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20652985 - 2¹⁵ = 20620217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19944 + ... + 20953.

It is an arithmetic number, because the mean of its divisors is an integer number (3128697).

Almost surely, 2^20652985 is an apocalyptic number.

It is an amenable number.

20652985 is a deficient number, since it is larger than the sum of its proper divisors (4376591).

20652985 is a wasteful number, since it uses less digits than its factorization.

20652985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41003.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 20652985 is about 4544.5555338229. Note that the first 4 decimals coincide. The cubic root of 20652985 is about 274.3643057564.

It can be divided in two parts, 2065 and 2985, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 20652985 in words is "twenty million, six hundred fifty-two thousand, nine hundred eighty-five".