19620947 has 2 divisors, whose sum is σ = 19620948. Its totient is φ = 19620946.

The previous prime is 19620929. The next prime is 19620983. The reversal of 19620947 is 74902691.

It is a weak prime.

It is an emirp because it is prime and its reverse (74902691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19620947 - 2²⁰ = 18572371 is a prime.

It is a super-2 number, since 2×19620947² = 769963122353618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19620947.

It is not a weakly prime, because it can be changed into another prime (19620917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810473 + 9810474.

It is an arithmetic number, because the mean of its divisors is an integer number (9810474).

Almost surely, 2^19620947 is an apocalyptic number.

19620947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19620947 is an equidigital number, since it uses as much as digits as its factorization.

19620947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 19620947 is about 4429.5538150021. The cubic root of 19620947 is about 269.7159655954.

The spelling of 19620947 in words is "nineteen million, six hundred twenty thousand, nine hundred forty-seven".