19620897 has 4 divisors (see below), whose sum is σ = 26161200. Its totient is φ = 13080596.

The previous prime is 19620889. The next prime is 19620917. The reversal of 19620897 is 79802691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79802691 = 3 ⋅26600897.

It is a cyclic number.

It is not a de Polignac number, because 19620897 - 2³ = 19620889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19620877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3270147 + ... + 3270152.

It is an arithmetic number, because the mean of its divisors is an integer number (6540300).

Almost surely, 2^19620897 is an apocalyptic number.

It is an amenable number.

19620897 is a deficient number, since it is larger than the sum of its proper divisors (6540303).

19620897 is an equidigital number, since it uses as much as digits as its factorization.

19620897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6540302.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 19620897 is about 4429.5481710892. The cubic root of 19620897 is about 269.7157364898.

The spelling of 19620897 in words is "nineteen million, six hundred twenty thousand, eight hundred ninety-seven".