20475642 has 16 divisors (see below), whose sum is σ = 44674272. Its totient is φ = 6204720.

The previous prime is 20475641. The next prime is 20475643. The reversal of 20475642 is 24657402.

It is an interprime number because it is at equal distance from previous prime (20475641) and next prime (20475643).

It is not an unprimeable number, because it can be changed into a prime (20475641) 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, 155053 + ... + 155184.

It is an arithmetic number, because the mean of its divisors is an integer number (2792142).

Almost surely, 2^20475642 is an apocalyptic number.

20475642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20475642 is an abundant number, since it is smaller than the sum of its proper divisors (24198630).

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

20475642 is a wasteful number, since it uses less digits than its factorization.

20475642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310253.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 20475642 is about 4525.0018784526. The cubic root of 20475642 is about 273.5767436458.

The spelling of 20475642 in words is "twenty million, four hundred seventy-five thousand, six hundred forty-two".