20145923 has 8 divisors (see below), whose sum is σ = 23818080. Its totient is φ = 16672320.

The previous prime is 20145911. The next prime is 20145943. The reversal of 20145923 is 32954102.

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

It is not a de Polignac number, because 20145923 - 2⁶ = 20145859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20145892 and 20145901.

It is not an unprimeable number, because it can be changed into a prime (20145943) 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, 49418 + ... + 49823.

It is an arithmetic number, because the mean of its divisors is an integer number (2977260).

Almost surely, 2^20145923 is an apocalyptic number.

20145923 is a deficient number, since it is larger than the sum of its proper divisors (3672157).

20145923 is an equidigital number, since it uses as much as digits as its factorization.

20145923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99277.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20145923 is about 4488.4209918411. The cubic root of 20145923 is about 272.1003225304.

The spelling of 20145923 in words is "twenty million, one hundred forty-five thousand, nine hundred twenty-three".