20307478 has 8 divisors (see below), whose sum is σ = 31109472. Its totient is φ = 9937656.

The previous prime is 20307467. The next prime is 20307509. The reversal of 20307478 is 87470302.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107925 + ... + 108112.

It is an arithmetic number, because the mean of its divisors is an integer number (3888684).

Almost surely, 2^20307478 is an apocalyptic number.

20307478 is a deficient number, since it is larger than the sum of its proper divisors (10801994).

20307478 is a wasteful number, since it uses less digits than its factorization.

20307478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216086.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20307478 is about 4506.3819190122. The cubic root of 20307478 is about 272.8257328604.

The spelling of 20307478 in words is "twenty million, three hundred seven thousand, four hundred seventy-eight".