20361858 has 32 divisors (see below), whose sum is σ = 45271872. Its totient is φ = 6052800.

The previous prime is 20361851. The next prime is 20361889. The reversal of 20361858 is 85816302.

It is a happy number.

It is a super-2 number, since 2×20361858² = 829210522424328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20361851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588 + ... + 6408.

It is an arithmetic number, because the mean of its divisors is an integer number (1414746).

Almost surely, 2^20361858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20361858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22635936).

20361858 is an abundant number, since it is smaller than the sum of its proper divisors (24910014).

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

20361858 is a wasteful number, since it uses less digits than its factorization.

20361858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5890.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20361858 is about 4512.4115503797. The cubic root of 20361858 is about 273.0690429030.

The spelling of 20361858 in words is "twenty million, three hundred sixty-one thousand, eight hundred fifty-eight".