20409374 has 8 divisors (see below), whose sum is σ = 31265568. Its totient is φ = 9987520.

The previous prime is 20409371. The next prime is 20409383. The reversal of 20409374 is 47390402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409371) 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, 108467 + ... + 108654.

It is an arithmetic number, because the mean of its divisors is an integer number (3908196).

Almost surely, 2^20409374 is an apocalyptic number.

20409374 is a deficient number, since it is larger than the sum of its proper divisors (10856194).

20409374 is a wasteful number, since it uses less digits than its factorization.

20409374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217170.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20409374 is about 4517.6735163135. The cubic root of 20409374 is about 273.2812872680.

Adding to 20409374 its reverse (47390402), we get a palindrome (67799776).

The spelling of 20409374 in words is "twenty million, four hundred nine thousand, three hundred seventy-four".