20854156 has 6 divisors (see below), whose sum is σ = 36494780. Its totient is φ = 10427076.

The previous prime is 20854147. The next prime is 20854159. The reversal of 20854156 is 65145802.

It is not an unprimeable number, because it can be changed into a prime (20854159) by changing a digit.

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 as a sum of consecutive naturals, namely, 2606766 + ... + 2606773.

Almost surely, 2^20854156 is an apocalyptic number.

It is an amenable number.

20854156 is a deficient number, since it is larger than the sum of its proper divisors (15640624).

20854156 is a wasteful number, since it uses less digits than its factorization.

20854156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5213543 (or 5213541 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 20854156 is about 4566.6350850489. The cubic root of 20854156 is about 275.2522467900.

Adding to 20854156 its reverse (65145802), we get a palindrome (85999958).

It can be divided in two parts, 2085 and 4156, that added together give a square (6241 = 79²).

The spelling of 20854156 in words is "twenty million, eight hundred fifty-four thousand, one hundred fifty-six".