20649963 has 8 divisors (see below), whose sum is σ = 27655488. Its totient is φ = 13705544.

The previous prime is 20649953. The next prime is 20649973. The reversal of 20649963 is 36994602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20649953) and next prime (20649973).

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

It is a cyclic number.

It is not a de Polignac number, because 20649963 - 2⁴ = 20649947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20649953) 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, 14481 + ... + 15842.

It is an arithmetic number, because the mean of its divisors is an integer number (3456936).

Almost surely, 2^20649963 is an apocalyptic number.

20649963 is a deficient number, since it is larger than the sum of its proper divisors (7005525).

20649963 is a wasteful number, since it uses less digits than its factorization.

20649963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30553.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 20649963 is about 4544.2230358995. The cubic root of 20649963 is about 274.3509231973.

It can be divided in two parts, 20649 and 963, that added together give a palindrome (21612).

The spelling of 20649963 in words is "twenty million, six hundred forty-nine thousand, nine hundred sixty-three".