19900453 has 4 divisors (see below), whose sum is σ = 19924480. Its totient is φ = 19876428.

The previous prime is 19900417. The next prime is 19900459. The reversal of 19900453 is 35400991.

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: 35400991 = 67 ⋅528373.

It is a 5-Lehmer number, since φ(19900453) divides (19900453-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 19900453 - 2¹⁷ = 19769381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19900459) 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, 10725 + ... + 12442.

It is an arithmetic number, because the mean of its divisors is an integer number (4981120).

Almost surely, 2^19900453 is an apocalyptic number.

It is an amenable number.

19900453 is a deficient number, since it is larger than the sum of its proper divisors (24027).

19900453 is an equidigital number, since it uses as much as digits as its factorization.

19900453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24026.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 19900453 is about 4460.9923783840. The cubic root of 19900453 is about 270.9906588466.

The spelling of 19900453 in words is "nineteen million, nine hundred thousand, four hundred fifty-three".