20418870 has 32 divisors (see below), whose sum is σ = 51889248. Its totient is φ = 5124608.

The previous prime is 20418841. The next prime is 20418883. The reversal of 20418870 is 7881402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19509 + ... + 20528.

It is an arithmetic number, because the mean of its divisors is an integer number (1621539).

Almost surely, 2^20418870 is an apocalyptic number.

20418870 is an abundant number, since it is smaller than the sum of its proper divisors (31470378).

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

20418870 is a wasteful number, since it uses less digits than its factorization.

20418870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40064.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20418870 is about 4518.7243775207. The cubic root of 20418870 is about 273.3236644739.

The spelling of 20418870 in words is "twenty million, four hundred eighteen thousand, eight hundred seventy".