20439146 has 16 divisors (see below), whose sum is σ = 37734144. Its totient is φ = 8085744.

The previous prime is 20439143. The next prime is 20439149. The reversal of 20439146 is 64193402.

It is an interprime number because it is at equal distance from previous prime (20439143) and next prime (20439149).

It is not an unprimeable number, because it can be changed into a prime (20439143) 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, 55970 + ... + 56333.

It is an arithmetic number, because the mean of its divisors is an integer number (2358384).

Almost surely, 2^20439146 is an apocalyptic number.

20439146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20439146 is a deficient number, since it is larger than the sum of its proper divisors (17294998).

20439146 is a wasteful number, since it uses less digits than its factorization.

20439146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112325.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20439146 is about 4520.9673743570. The cubic root of 20439146 is about 273.4141049546.

The spelling of 20439146 in words is "twenty million, four hundred thirty-nine thousand, one hundred forty-six".