20543870 has 32 divisors (see below), whose sum is σ = 38374560. Its totient is φ = 7912960.

The previous prime is 20543869. The next prime is 20543881. The reversal of 20543870 is 7834502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36209 + ... + 36771.

It is an arithmetic number, because the mean of its divisors is an integer number (1199205).

Almost surely, 2^20543870 is an apocalyptic number.

20543870 is a deficient number, since it is larger than the sum of its proper divisors (17830690).

20543870 is a wasteful number, since it uses less digits than its factorization.

20543870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20543870 is about 4532.5346110096. The cubic root of 20543870 is about 273.8802734065.

The spelling of 20543870 in words is "twenty million, five hundred forty-three thousand, eight hundred seventy".