20649029 has 4 divisors (see below), whose sum is σ = 21735840. Its totient is φ = 19562220.

The previous prime is 20649019. The next prime is 20649037. The reversal of 20649029 is 92094602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20649029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20648986 and 20649004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20649019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543377 + ... + 543414.

It is an arithmetic number, because the mean of its divisors is an integer number (5433960).

Almost surely, 2^20649029 is an apocalyptic number.

It is an amenable number.

20649029 is a deficient number, since it is larger than the sum of its proper divisors (1086811).

20649029 is a wasteful number, since it uses less digits than its factorization.

20649029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086810.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20649029 is about 4544.1202668944. The cubic root of 20649029 is about 274.3467868279.

The spelling of 20649029 in words is "twenty million, six hundred forty-nine thousand, twenty-nine".