20157347 has 16 divisors (see below), whose sum is σ = 25036800. Its totient is φ = 15837120.

The previous prime is 20157337. The next prime is 20157353. The reversal of 20157347 is 74375102.

It is a cyclic number.

It is not a de Polignac number, because 20157347 - 2⁶ = 20157283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20157317) 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 15 ways as a sum of consecutive naturals, for example, 1679 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1564800).

Almost surely, 2^20157347 is an apocalyptic number.

20157347 is a deficient number, since it is larger than the sum of its proper divisors (4879453).

20157347 is a wasteful number, since it uses less digits than its factorization.

20157347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4946.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20157347 is about 4489.6934193773. The cubic root of 20157347 is about 272.1517454528.

The spelling of 20157347 in words is "twenty million, one hundred fifty-seven thousand, three hundred forty-seven".