20442170 has 32 divisors (see below), whose sum is σ = 43884288. Its totient is φ = 6703488.

The previous prime is 20442151. The next prime is 20442173. The reversal of 20442170 is 7124402.

20442170 = T₇₃₅ + T₇₃₆ + ... + T₈₀₃.

It is not an unprimeable number, because it can be changed into a prime (20442173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4739 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (1371384).

Almost surely, 2^20442170 is an apocalyptic number.

20442170 is an abundant number, since it is smaller than the sum of its proper divisors (23442118).

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

20442170 is a wasteful number, since it uses less digits than its factorization.

20442170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12734.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20442170 is about 4521.3018036844. The cubic root of 20442170 is about 273.4275882883.

Adding to 20442170 its reverse (7124402), we get a palindrome (27566572).

The spelling of 20442170 in words is "twenty million, four hundred forty-two thousand, one hundred seventy".