20651045 has 8 divisors (see below), whose sum is σ = 25635960. Its totient is φ = 15951040.

The previous prime is 20651041. The next prime is 20651047. The reversal of 20651045 is 54015602.

It can be written as a sum of positive squares in 4 ways, for example, as 3602404 + 17048641 = 1898^2 + 4129^2 .

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

It is not a de Polignac number, because 20651045 - 2² = 20651041 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20651045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71066 + ... + 71355.

It is an arithmetic number, because the mean of its divisors is an integer number (3204495).

Almost surely, 2^20651045 is an apocalyptic number.

It is an amenable number.

20651045 is a deficient number, since it is larger than the sum of its proper divisors (4984915).

20651045 is a wasteful number, since it uses less digits than its factorization.

20651045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142455.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20651045 is about 4544.3420865952. The cubic root of 20651045 is about 274.3557148526.

Adding to 20651045 its reverse (54015602), we get a palindrome (74666647).

The spelling of 20651045 in words is "twenty million, six hundred fifty-one thousand, forty-five".