20461578 has 16 divisors (see below), whose sum is σ = 41131200. Its totient is φ = 6785856.

The previous prime is 20461547. The next prime is 20461579. The reversal of 20461578 is 87516402.

It is not an unprimeable number, because it can be changed into a prime (20461579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7375 + ... + 9762.

It is an arithmetic number, because the mean of its divisors is an integer number (2570700).

Almost surely, 2^20461578 is an apocalyptic number.

20461578 is an abundant number, since it is smaller than the sum of its proper divisors (20669622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20461578 is a wasteful number, since it uses less digits than its factorization.

20461578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17341.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20461578 is about 4523.4475790043. The cubic root of 20461578 is about 273.5140925442.

The spelling of 20461578 in words is "twenty million, four hundred sixty-one thousand, five hundred seventy-eight".