19920023 has 8 divisors (see below), whose sum is σ = 20556480. Its totient is φ = 19288800.

The previous prime is 19919989. The next prime is 19920031. The reversal of 19920023 is 32002991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19920023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19919974 and 19920001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19923023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7298 + ... + 9648.

It is an arithmetic number, because the mean of its divisors is an integer number (2569560).

Almost surely, 2^19920023 is an apocalyptic number.

19920023 is a deficient number, since it is larger than the sum of its proper divisors (636457).

19920023 is a wasteful number, since it uses less digits than its factorization.

19920023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 19920023 is about 4463.1852975201. The cubic root of 19920023 is about 271.0794600033.

The spelling of 19920023 in words is "nineteen million, nine hundred twenty thousand, twenty-three".