20643262 has 16 divisors (see below), whose sum is σ = 32194512. Its totient is φ = 9918720.

The previous prime is 20643257. The next prime is 20643269. The reversal of 20643262 is 26234602.

It is a happy number.

It is a super-2 number, since 2×20643262² = 852288532001288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643269) 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, 4462 + ... + 7822.

It is an arithmetic number, because the mean of its divisors is an integer number (2012157).

Almost surely, 2^20643262 is an apocalyptic number.

20643262 is a deficient number, since it is larger than the sum of its proper divisors (11551250).

20643262 is a wasteful number, since it uses less digits than its factorization.

20643262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20643262 is about 4543.4856663139. The cubic root of 20643262 is about 274.3212439765.

Adding to 20643262 its reverse (26234602), we get a palindrome (46877864).

The spelling of 20643262 in words is "twenty million, six hundred forty-three thousand, two hundred sixty-two".