19972633 has 4 divisors (see below), whose sum is σ = 20270800. Its totient is φ = 19674468.

The previous prime is 19972613. The next prime is 19972639. The reversal of 19972633 is 33627991.

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: 33627991 = 1439 ⋅23369.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19972633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19972639) 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, 148983 + ... + 149116.

It is an arithmetic number, because the mean of its divisors is an integer number (5067700).

Almost surely, 2^19972633 is an apocalyptic number.

It is an amenable number.

19972633 is a deficient number, since it is larger than the sum of its proper divisors (298167).

19972633 is an equidigital number, since it uses as much as digits as its factorization.

19972633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298166.

The product of its digits is 61236, while the sum is 40.

The square root of 19972633 is about 4469.0751839726. The cubic root of 19972633 is about 271.3178960336.

The spelling of 19972633 in words is "nineteen million, nine hundred seventy-two thousand, six hundred thirty-three".