20859436 has 48 divisors (see below), whose sum is σ = 41658624. Its totient is φ = 9066816.

The previous prime is 20859431. The next prime is 20859451. The reversal of 20859436 is 63495802.

It is a junction number, because it is equal to n+sod(n) for n = 20859395 and 20859404.

It is not an unprimeable number, because it can be changed into a prime (20859431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127891 + ... + 128053.

It is an arithmetic number, because the mean of its divisors is an integer number (867888).

Almost surely, 2^20859436 is an apocalyptic number.

20859436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20859436 is a deficient number, since it is larger than the sum of its proper divisors (20799188).

20859436 is a wasteful number, since it uses less digits than its factorization.

20859436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20859436 is about 4567.2131546491. The cubic root of 20859436 is about 275.2754749214.

The spelling of 20859436 in words is "twenty million, eight hundred fifty-nine thousand, four hundred thirty-six".