20629937947 has 2 divisors, whose sum is σ = 20629937948. Its totient is φ = 20629937946.

The previous prime is 20629937941. The next prime is 20629937963. The reversal of 20629937947 is 74973992602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20629937947 - 2³¹ = 18482454299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20629937891 and 20629937900.

It is not a weakly prime, because it can be changed into another prime (20629937941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314968973 + 10314968974.

It is an arithmetic number, because the mean of its divisors is an integer number (10314968974).

Almost surely, 2^20629937947 is an apocalyptic number.

20629937947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629937947 is an equidigital number, since it uses as much as digits as its factorization.

20629937947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 58.

The spelling of 20629937947 in words is "twenty billion, six hundred twenty-nine million, nine hundred thirty-seven thousand, nine hundred forty-seven".