20691846 has 48 divisors (see below), whose sum is σ = 51795744. Its totient is φ = 5847552.

The previous prime is 20691833. The next prime is 20691851. The reversal of 20691846 is 64819602.

It is a self number, because there is not a number n which added to its sum of digits gives 20691846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11376 + ... + 13068.

It is an arithmetic number, because the mean of its divisors is an integer number (1079078).

Almost surely, 2^20691846 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20691846, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25897872).

20691846 is an abundant number, since it is smaller than the sum of its proper divisors (31103898).

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

20691846 is a wasteful number, since it uses less digits than its factorization.

20691846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20691846 is about 4548.8290801040. The cubic root of 20691846 is about 274.5362807510.

The spelling of 20691846 in words is "twenty million, six hundred ninety-one thousand, eight hundred forty-six".