20651043 has 32 divisors (see below), whose sum is σ = 33625600. Its totient is φ = 11010816.

The previous prime is 20651041. The next prime is 20651047. The reversal of 20651043 is 34015602.

It is a happy number.

It is not a de Polignac number, because 20651043 - 2¹ = 20651041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 28773 + ... + 29481.

It is an arithmetic number, because the mean of its divisors is an integer number (1050800).

Almost surely, 2^20651043 is an apocalyptic number.

20651043 is a deficient number, since it is larger than the sum of its proper divisors (12974557).

20651043 is a wasteful number, since it uses less digits than its factorization.

20651043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20651043 is about 4544.3418665413. The cubic root of 20651043 is about 274.3557059957.

Adding to 20651043 its reverse (34015602), we get a palindrome (54666645).

The spelling of 20651043 in words is "twenty million, six hundred fifty-one thousand, forty-three".