20648429 has 8 divisors (see below), whose sum is σ = 21121560. Its totient is φ = 20178496.

The previous prime is 20648417. The next prime is 20648443. The reversal of 20648429 is 92484602.

It can be written as a sum of positive squares in 4 ways, for example, as 6002500 + 14645929 = 2450^2 + 3827^2 .

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 20648429 - 2⁴ = 20648413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668429) 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, 16187 + ... + 17415.

It is an arithmetic number, because the mean of its divisors is an integer number (2640195).

Almost surely, 2^20648429 is an apocalyptic number.

It is an amenable number.

20648429 is a deficient number, since it is larger than the sum of its proper divisors (473131).

20648429 is a wasteful number, since it uses less digits than its factorization.

20648429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 20648429 is about 4544.0542470353. The cubic root of 20648429 is about 274.3441295654.

The spelling of 20648429 in words is "twenty million, six hundred forty-eight thousand, four hundred twenty-nine".