20286156 has 48 divisors (see below), whose sum is σ = 51907968. Its totient is φ = 6115200.

The previous prime is 20286139. The next prime is 20286157. The reversal of 20286156 is 65168202.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20286157) 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, 41071 + ... + 41561.

It is an arithmetic number, because the mean of its divisors is an integer number (1081416).

Almost surely, 2^20286156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20286156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25953984).

20286156 is an abundant number, since it is smaller than the sum of its proper divisors (31621812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20286156 is a wasteful number, since it uses less digits than its factorization.

20286156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20286156 is about 4504.0155417139. The cubic root of 20286156 is about 272.7302142309.

The spelling of 20286156 in words is "twenty million, two hundred eighty-six thousand, one hundred fifty-six".