20651072 has 28 divisors (see below), whose sum is σ = 44133516. Its totient is φ = 9530880.

The previous prime is 20651063. The next prime is 20651077. The reversal of 20651072 is 27015602.

It can be written as a sum of positive squares in 2 ways, for example, as 2876416 + 17774656 = 1696^2 + 4216^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20651077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11579 + ... + 13242.

It is an arithmetic number, because the mean of its divisors is an integer number (1576197).

Almost surely, 2^20651072 is an apocalyptic number.

It is an amenable number.

20651072 is an abundant number, since it is smaller than the sum of its proper divisors (23482444).

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

20651072 is a wasteful number, since it uses less digits than its factorization.

20651072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24846 (or 24836 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20651072 is about 4544.3450573212. The cubic root of 20651072 is about 274.3558344204.

Adding to 20651072 its reverse (27015602), we get a palindrome (47666674).

The spelling of 20651072 in words is "twenty million, six hundred fifty-one thousand, seventy-two".