20247629 has 6 divisors (see below), whose sum is σ = 21509034. Its totient is φ = 19056320.

The previous prime is 20247611. The next prime is 20247671. The reversal of 20247629 is 92674202.

It can be written as a sum of positive squares in 3 ways, for example, as 5769604 + 14478025 = 2402^2 + 3805^2 .

It is not a de Polignac number, because 20247629 - 2⁸ = 20247373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20247595 and 20247604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34742 + ... + 35319.

It is an arithmetic number, because the mean of its divisors is an integer number (3584839).

Almost surely, 2^20247629 is an apocalyptic number.

It is an amenable number.

20247629 is a deficient number, since it is larger than the sum of its proper divisors (1261405).

20247629 is an equidigital number, since it uses as much as digits as its factorization.

20247629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70095 (or 70078 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20247629 is about 4499.7365478437. The cubic root of 20247629 is about 272.5574505024.

The spelling of 20247629 in words is "twenty million, two hundred forty-seven thousand, six hundred twenty-nine".