20945810 has 16 divisors (see below), whose sum is σ = 37800000. Its totient is φ = 8356656.

The previous prime is 20945807. The next prime is 20945833. The reversal of 20945810 is 1854902.

It is a super-2 number, since 2×20945810² = 877453913112200, which contains 22 as substring.

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, 1691 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (2362500).

Almost surely, 2^20945810 is an apocalyptic number.

20945810 is a deficient number, since it is larger than the sum of its proper divisors (16854190).

20945810 is a wasteful number, since it uses less digits than its factorization.

20945810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5425.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20945810 is about 4576.6592619508. The cubic root of 20945810 is about 275.6549019480.

The spelling of 20945810 in words is "twenty million, nine hundred forty-five thousand, eight hundred ten".