20347145 has 32 divisors (see below), whose sum is σ = 30336768. Its totient is φ = 12757248.

The previous prime is 20347121. The next prime is 20347169. The reversal of 20347145 is 54174302.

It is an interprime number because it is at equal distance from previous prime (20347121) and next prime (20347169).

It is not a de Polignac number, because 20347145 - 2⁸ = 20346889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89522 + ... + 89748.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^20347145 is an apocalyptic number.

It is an amenable number.

20347145 is a deficient number, since it is larger than the sum of its proper divisors (9989623).

20347145 is a wasteful number, since it uses less digits than its factorization.

20347145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20347145 is about 4510.7809745098. The cubic root of 20347145 is about 273.0032559644.

The spelling of 20347145 in words is "twenty million, three hundred forty-seven thousand, one hundred forty-five".