20747629 has 18 divisors (see below), whose sum is σ = 24817230. Its totient is φ = 17294256.

The previous prime is 20747603. The next prime is 20747641. The reversal of 20747629 is 92674702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 362404 = 4515^2 + 602^2 .

It is not a de Polignac number, because 20747629 - 2⁷ = 20747501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747729) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 90487 + ... + 90715.

It is an arithmetic number, because the mean of its divisors is an integer number (1378735).

Almost surely, 2^20747629 is an apocalyptic number.

It is an amenable number.

20747629 is a deficient number, since it is larger than the sum of its proper divisors (4069601).

20747629 is an equidigital number, since it uses as much as digits as its factorization.

20747629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 20747629 is about 4554.9565310769. The cubic root of 20747629 is about 274.7827661843.

The spelling of 20747629 in words is "twenty million, seven hundred forty-seven thousand, six hundred twenty-nine".