20645061 has 8 divisors (see below), whose sum is σ = 27554784. Its totient is φ = 13749360.

The previous prime is 20645047. The next prime is 20645069. The reversal of 20645061 is 16054602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20645061 - 2⁶ = 20644997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645069) 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 in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (3444348).

Almost surely, 2^20645061 is an apocalyptic number.

It is an amenable number.

20645061 is a deficient number, since it is larger than the sum of its proper divisors (6909723).

20645061 is a wasteful number, since it uses less digits than its factorization.

20645061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20645061 is about 4543.6836377547. The cubic root of 20645061 is about 274.3292125102.

Adding to 20645061 its reverse (16054602), we get a palindrome (36699663).

The spelling of 20645061 in words is "twenty million, six hundred forty-five thousand, sixty-one".