20393670 has 64 divisors (see below), whose sum is σ = 55261440. Its totient is φ = 4771200.

The previous prime is 20393651. The next prime is 20393677. The reversal of 20393670 is 7639302.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20393677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8505 + ... + 10635.

It is an arithmetic number, because the mean of its divisors is an integer number (863460).

Almost surely, 2^20393670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20393670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27630720).

20393670 is an abundant number, since it is smaller than the sum of its proper divisors (34867770).

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

20393670 is a wasteful number, since it uses less digits than its factorization.

20393670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181.

The product of its (nonzero) digits is 6804, while the sum is 30.

The square root of 20393670 is about 4515.9351191088. The cubic root of 20393670 is about 273.2111771553.

The spelling of 20393670 in words is "twenty million, three hundred ninety-three thousand, six hundred seventy".