19973530 has 16 divisors (see below), whose sum is σ = 36446184. Its totient is φ = 7879680.

The previous prime is 19973501. The next prime is 19973539. The reversal of 19973530 is 3537991.

It can be written as a sum of positive squares in 4 ways, for example, as 17280649 + 2692881 = 4157^2 + 1641^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19973530.

It is not an unprimeable number, because it can be changed into a prime (19973539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12951 + ... + 14410.

Almost surely, 2^19973530 is an apocalyptic number.

19973530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19973530 is a deficient number, since it is larger than the sum of its proper divisors (16472654).

19973530 is a wasteful number, since it uses less digits than its factorization.

19973530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27441.

The product of its (nonzero) digits is 25515, while the sum is 37.

The square root of 19973530 is about 4469.1755391795. The cubic root of 19973530 is about 271.3219577333.

It can be divided in two parts, 19973 and 530, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 19973530 in words is "nineteen million, nine hundred seventy-three thousand, five hundred thirty".