20217378 has 8 divisors (see below), whose sum is σ = 40434768. Its totient is φ = 6739124.

The previous prime is 20217371. The next prime is 20217401. The reversal of 20217378 is 87371202.

It is a sphenic number, since it is the product of 3 distinct primes.

20217378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20217371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1684776 + ... + 1684787.

It is an arithmetic number, because the mean of its divisors is an integer number (5054346).

Almost surely, 2^20217378 is an apocalyptic number.

20217378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20217378 is a wasteful number, since it uses less digits than its factorization.

20217378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369568.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20217378 is about 4496.3738723554. The cubic root of 20217378 is about 272.4216445591.

The spelling of 20217378 in words is "twenty million, two hundred seventeen thousand, three hundred seventy-eight".