20629747 has 2 divisors, whose sum is σ = 20629748. Its totient is φ = 20629746.

The previous prime is 20629717. The next prime is 20629751. The reversal of 20629747 is 74792602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20629747 is a prime.

It is a super-2 number, since 2×20629747² = 851172922568018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20629717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314873 + 10314874.

It is an arithmetic number, because the mean of its divisors is an integer number (10314874).

Almost surely, 2^20629747 is an apocalyptic number.

20629747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629747 is an equidigital number, since it uses as much as digits as its factorization.

20629747 is an evil number, because the sum of its binary digits is even.

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

The square root of 20629747 is about 4541.9981285773. The cubic root of 20629747 is about 274.2613655040.

The spelling of 20629747 in words is "twenty million, six hundred twenty-nine thousand, seven hundred forty-seven".