20353978 has 16 divisors (see below), whose sum is σ = 32292000. Its totient is φ = 9595152.

The previous prime is 20353967. The next prime is 20354023. The reversal of 20353978 is 87935302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7533 + ... + 9871.

It is an arithmetic number, because the mean of its divisors is an integer number (2018250).

Almost surely, 2^20353978 is an apocalyptic number.

20353978 is a deficient number, since it is larger than the sum of its proper divisors (11938022).

20353978 is a wasteful number, since it uses less digits than its factorization.

20353978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20353978 is about 4511.5383185783. The cubic root of 20353978 is about 273.0338126260.

The spelling of 20353978 in words is "twenty million, three hundred fifty-three thousand, nine hundred seventy-eight".