20157146 has 16 divisors (see below), whose sum is σ = 31436640. Its totient is φ = 9681840.

The previous prime is 20157143. The next prime is 20157149. The reversal of 20157146 is 64175102.

It is an interprime number because it is at equal distance from previous prime (20157143) and next prime (20157149).

It is not an unprimeable number, because it can be changed into a prime (20157143) 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 7 ways as a sum of consecutive naturals, for example, 12401 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (1964790).

Almost surely, 2^20157146 is an apocalyptic number.

20157146 is a deficient number, since it is larger than the sum of its proper divisors (11279494).

20157146 is a wasteful number, since it uses less digits than its factorization.

20157146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20157146 is about 4489.6710347196. The cubic root of 20157146 is about 272.1508408582.

The spelling of 20157146 in words is "twenty million, one hundred fifty-seven thousand, one hundred forty-six".