20609610 has 128 divisors (see below), whose sum is σ = 62705664. Its totient is φ = 4224000.

The previous prime is 20609581. The next prime is 20609639. The reversal of 20609610 is 1690602.

It is an interprime number because it is at equal distance from previous prime (20609581) and next prime (20609639).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81985 + ... + 82235.

It is an arithmetic number, because the mean of its divisors is an integer number (489888).

Almost surely, 2^20609610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20609610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31352832).

20609610 is an abundant number, since it is smaller than the sum of its proper divisors (42096054).

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

20609610 is a wasteful number, since it uses less digits than its factorization.

20609610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20609610 is about 4539.7808317142. The cubic root of 20609610 is about 274.1720995999.

The spelling of 20609610 in words is "twenty million, six hundred nine thousand, six hundred ten".