20285156 has 12 divisors (see below), whose sum is σ = 35712768. Its totient is φ = 10081512.

The previous prime is 20285099. The next prime is 20285263. The reversal of 20285156 is 65158202.

It is a super-2 number, since 2×20285156² = 822975107888672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14516 + ... + 15851.

It is an arithmetic number, because the mean of its divisors is an integer number (2976064).

Almost surely, 2^20285156 is an apocalyptic number.

It is an amenable number.

20285156 is a deficient number, since it is larger than the sum of its proper divisors (15427612).

20285156 is a wasteful number, since it uses less digits than its factorization.

20285156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30538 (or 30536 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 20285156 is about 4503.9045282954. The cubic root of 20285156 is about 272.7257327724.

It can be divided in two parts, 202 and 85156, that added together give a palindrome (85358).

The spelling of 20285156 in words is "twenty million, two hundred eighty-five thousand, one hundred fifty-six".