20865632 has 24 divisors (see below), whose sum is σ = 42191856. Its totient is φ = 10150272.

The previous prime is 20865617. The next prime is 20865641. The reversal of 20865632 is 23656802.

It is a Harshad number since it is a multiple of its sum of digits (32).

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 in 3 ways as a sum of consecutive naturals, for example, 7628 + ... + 9995.

It is an arithmetic number, because the mean of its divisors is an integer number (1757994).

Almost surely, 2^20865632 is an apocalyptic number.

It is an amenable number.

20865632 is an abundant number, since it is smaller than the sum of its proper divisors (21326224).

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

20865632 is a wasteful number, since it uses less digits than its factorization.

20865632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17670 (or 17662 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 20865632 is about 4567.8914172734. The cubic root of 20865632 is about 275.3027277834.

It can be divided in two parts, 20865 and 632, that multiplied together give a triangular number (13186680 = T₅₁₃₅).

The spelling of 20865632 in words is "twenty million, eight hundred sixty-five thousand, six hundred thirty-two".