20172070 has 16 divisors (see below), whose sum is σ = 36369648. Its totient is φ = 8055520.

The previous prime is 20172037. The next prime is 20172073. The reversal of 20172070 is 7027102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172073) 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, 6705 + ... + 9235.

It is an arithmetic number, because the mean of its divisors is an integer number (2273103).

Almost surely, 2^20172070 is an apocalyptic number.

20172070 is a deficient number, since it is larger than the sum of its proper divisors (16197578).

20172070 is a wasteful number, since it uses less digits than its factorization.

20172070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 20172070 is about 4491.3327643362. The cubic root of 20172070 is about 272.2179895373.

Adding to 20172070 its reverse (7027102), we get a palindrome (27199172).

The spelling of 20172070 in words is "twenty million, one hundred seventy-two thousand, seventy".