19956023 has 4 divisors (see below), whose sum is σ = 21006360. Its totient is φ = 18905688.

The previous prime is 19955989. The next prime is 19956043. The reversal of 19956023 is 32065991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32065991 = 463 ⋅69257.

It is a cyclic number.

It is not a de Polignac number, because 19956023 - 2¹⁴ = 19939639 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 (19956043) 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, 525140 + ... + 525177.

It is an arithmetic number, because the mean of its divisors is an integer number (5251590).

Almost surely, 2^19956023 is an apocalyptic number.

19956023 is a deficient number, since it is larger than the sum of its proper divisors (1050337).

19956023 is a wasteful number, since it uses less digits than its factorization.

19956023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050336.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 19956023 is about 4467.2164711373. The cubic root of 19956023 is about 271.2426624191.

The spelling of 19956023 in words is "nineteen million, nine hundred fifty-six thousand, twenty-three".