20834145 has 64 divisors (see below), whose sum is σ = 39325440. Its totient is φ = 10450944.

The previous prime is 20834137. The next prime is 20834147. The reversal of 20834145 is 54143802.

20834145 = T₄₂₄ + T₄₂₅ + ... + T₅₈₅.

It is not a de Polignac number, because 20834145 - 2³ = 20834137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20834147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 214737 + ... + 214833.

It is an arithmetic number, because the mean of its divisors is an integer number (614460).

Almost surely, 2^20834145 is an apocalyptic number.

It is an amenable number.

20834145 is a deficient number, since it is larger than the sum of its proper divisors (18491295).

20834145 is a wasteful number, since it uses less digits than its factorization.

20834145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20834145 is about 4564.4435586389. The cubic root of 20834145 is about 275.1641774472.

Adding to 20834145 its reverse (54143802), we get a palindrome (74977947).

The spelling of 20834145 in words is "twenty million, eight hundred thirty-four thousand, one hundred forty-five".