20645414 has 4 divisors (see below), whose sum is σ = 30968124. Its totient is φ = 10322706.

The previous prime is 20645413. The next prime is 20645441. The reversal of 20645414 is 41454602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645413) by changing a digit.

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 as a sum of consecutive naturals, namely, 5161352 + ... + 5161355.

It is an arithmetic number, because the mean of its divisors is an integer number (7742031).

Almost surely, 2^20645414 is an apocalyptic number.

20645414 is a deficient number, since it is larger than the sum of its proper divisors (10322710).

20645414 is a wasteful number, since it uses less digits than its factorization.

20645414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10322709.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 20645414 is about 4543.7224827227. The cubic root of 20645414 is about 274.3307760425.

The spelling of 20645414 in words is "twenty million, six hundred forty-five thousand, four hundred fourteen".