20145942 has 16 divisors (see below), whose sum is σ = 44768880. Its totient is φ = 6715296.

The previous prime is 20145911. The next prime is 20145943. The reversal of 20145942 is 24954102.

20145942 is a `hidden beast` number, since 201 + 459 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186483 + ... + 186590.

It is an arithmetic number, because the mean of its divisors is an integer number (2798055).

Almost surely, 2^20145942 is an apocalyptic number.

20145942 is an abundant number, since it is smaller than the sum of its proper divisors (24622938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20145942 is a wasteful number, since it uses less digits than its factorization.

20145942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373084 (or 373078 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20145942 is about 4488.4231083979. The cubic root of 20145942 is about 272.1004080714.

The spelling of 20145942 in words is "twenty million, one hundred forty-five thousand, nine hundred forty-two".