20361040 has 80 divisors (see below), whose sum is σ = 54782208. Its totient is φ = 6893568.

The previous prime is 20361037. The next prime is 20361101. The reversal of 20361040 is 4016302.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 57504 + ... + 57856.

Almost surely, 2^20361040 is an apocalyptic number.

20361040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20361040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27391104).

20361040 is an abundant number, since it is smaller than the sum of its proper divisors (34421168).

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

20361040 is a wasteful number, since it uses less digits than its factorization.

20361040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20361040 is about 4512.3209105736. The cubic root of 20361040 is about 273.0653861728.

Adding to 20361040 its reverse (4016302), we get a palindrome (24377342).

The spelling of 20361040 in words is "twenty million, three hundred sixty-one thousand, forty".