20742423 has 8 divisors (see below), whose sum is σ = 29784048. Its totient is φ = 12764544.

The previous prime is 20742413. The next prime is 20742443. The reversal of 20742423 is 32424702.

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

It is not a de Polignac number, because 20742423 - 2⁵ = 20742391 is a prime.

It is a super-2 number, since 2×20742423² = 860496223821858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20742393 and 20742402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742413) 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, 265890 + ... + 265967.

It is an arithmetic number, because the mean of its divisors is an integer number (3723006).

Almost surely, 2^20742423 is an apocalyptic number.

20742423 is a deficient number, since it is larger than the sum of its proper divisors (9041625).

20742423 is a wasteful number, since it uses less digits than its factorization.

20742423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531873.

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 20742423 is about 4554.3850298366. The cubic root of 20742423 is about 274.7597814094.

The spelling of 20742423 in words is "twenty million, seven hundred forty-two thousand, four hundred twenty-three".