20361550 has 24 divisors (see below), whose sum is σ = 41316552. Its totient is φ = 7404000.

The previous prime is 20361547. The next prime is 20361553. The reversal of 20361550 is 5516302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20361547) and next prime (20361553).

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361553) 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 in 11 ways as a sum of consecutive naturals, for example, 17961 + ... + 19060.

It is an arithmetic number, because the mean of its divisors is an integer number (1721523).

Almost surely, 2^20361550 is an apocalyptic number.

20361550 is an abundant number, since it is smaller than the sum of its proper divisors (20955002).

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

20361550 is a wasteful number, since it uses less digits than its factorization.

20361550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37044 (or 37039 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20361550 is about 4512.3774221579. The cubic root of 20361550 is about 273.0676660528.

Adding to 20361550 its reverse (5516302), we get a palindrome (25877852).

The spelling of 20361550 in words is "twenty million, three hundred sixty-one thousand, five hundred fifty".