19897553 has 12 divisors (see below), whose sum is σ = 22487040. Its totient is φ = 17564976.

The previous prime is 19897543. The next prime is 19897561. The reversal of 19897553 is 35579891.

It is not a de Polignac number, because 19897553 - 2⁶ = 19897489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19897498 and 19897507.

It is not an unprimeable number, because it can be changed into a prime (19897543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1328 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (1873920).

Almost surely, 2^19897553 is an apocalyptic number.

19897553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19897553 is a deficient number, since it is larger than the sum of its proper divisors (2589487).

19897553 is a wasteful number, since it uses less digits than its factorization.

19897553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5168 (or 5155 counting only the distinct ones).

The product of its digits is 340200, while the sum is 47.

The square root of 19897553 is about 4460.6673267573. The cubic root of 19897553 is about 270.9774948064.

The spelling of 19897553 in words is "nineteen million, eight hundred ninety-seven thousand, five hundred fifty-three".