20651106 has 64 divisors (see below), whose sum is σ = 49335552. Its totient is φ = 5640192.

The previous prime is 20651101. The next prime is 20651117. The reversal of 20651106 is 60115602.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20651101) 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, 150670 + ... + 150806.

It is an arithmetic number, because the mean of its divisors is an integer number (770868).

Almost surely, 2^20651106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20651106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24667776).

20651106 is an abundant number, since it is smaller than the sum of its proper divisors (28684446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20651106 is a wasteful number, since it uses less digits than its factorization.

20651106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20651106 is about 4544.3487982328. The cubic root of 20651106 is about 274.3559849871.

Adding to 20651106 its reverse (60115602), we get a palindrome (80766708).

The spelling of 20651106 in words is "twenty million, six hundred fifty-one thousand, one hundred six".