20861235 has 24 divisors (see below), whose sum is σ = 37003824. Its totient is φ = 10866240.

The previous prime is 20861209. The next prime is 20861249. The reversal of 20861235 is 53216802.

It is not a de Polignac number, because 20861235 - 2¹⁰ = 20860211 is a prime.

It is a super-2 number, since 2×20861235² = 870382251450450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20861199 and 20861208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3456 + ... + 7325.

It is an arithmetic number, because the mean of its divisors is an integer number (1541826).

Almost surely, 2^20861235 is an apocalyptic number.

20861235 is a deficient number, since it is larger than the sum of its proper divisors (16142589).

20861235 is a wasteful number, since it uses less digits than its factorization.

20861235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10835 (or 10832 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20861235 is about 4567.4100976374. The cubic root of 20861235 is about 275.2833883080.

It can be divided in two parts, 2086 and 1235, that added together give a triangular number (3321 = T₈₁).

The spelling of 20861235 in words is "twenty million, eight hundred sixty-one thousand, two hundred thirty-five".