20610851 has 16 divisors (see below), whose sum is σ = 22861440. Its totient is φ = 18493440.

The previous prime is 20610847. The next prime is 20610853. The reversal of 20610851 is 15801602.

20610851 = 829² + 830² + ... + 857².

It is a cyclic number.

It is not a de Polignac number, because 20610851 - 2² = 20610847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20610853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47606 + ... + 48036.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 2^20610851 is an apocalyptic number.

20610851 is a deficient number, since it is larger than the sum of its proper divisors (2250589).

20610851 is a wasteful number, since it uses less digits than its factorization.

20610851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 20610851 is about 4539.9175102638. The cubic root of 20610851 is about 274.1776025464.

Subtracting from 20610851 its reverse (15801602), we obtain a square (4809249 = 2193²).

The spelling of 20610851 in words is "twenty million, six hundred ten thousand, eight hundred fifty-one".