20347406 has 8 divisors (see below), whose sum is σ = 30545424. Its totient is φ = 10165600.

The previous prime is 20347361. The next prime is 20347409. The reversal of 20347406 is 60474302.

It is a happy number.

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 (20347409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (3818178).

Almost surely, 2^20347406 is an apocalyptic number.

20347406 is a deficient number, since it is larger than the sum of its proper divisors (10198018).

20347406 is a wasteful number, since it uses less digits than its factorization.

20347406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20347406 is about 4510.8099051057. The cubic root of 20347406 is about 273.0044232624.

The spelling of 20347406 in words is "twenty million, three hundred forty-seven thousand, four hundred six".