20217438 has 20 divisors (see below), whose sum is σ = 45302400. Its totient is φ = 6739092.

The previous prime is 20217427. The next prime is 20217467. The reversal of 20217438 is 83471202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62238 + ... + 62561.

It is an arithmetic number, because the mean of its divisors is an integer number (2265120).

Almost surely, 2^20217438 is an apocalyptic number.

20217438 is an abundant number, since it is smaller than the sum of its proper divisors (25084962).

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

20217438 is a wasteful number, since it uses less digits than its factorization.

20217438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124813 (or 124804 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20217438 is about 4496.3805443935. The cubic root of 20217438 is about 272.4219140514.

The spelling of 20217438 in words is "twenty million, two hundred seventeen thousand, four hundred thirty-eight".