20041780 has 24 divisors (see below), whose sum is σ = 45914400. Its totient is φ = 7287840.

The previous prime is 20041771. The next prime is 20041783. The reversal of 20041780 is 8714002.

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 (20041783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45330 + ... + 45769.

It is an arithmetic number, because the mean of its divisors is an integer number (1913100).

Almost surely, 2^20041780 is an apocalyptic number.

20041780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20041780 is an abundant number, since it is smaller than the sum of its proper divisors (25872620).

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

20041780 is a wasteful number, since it uses less digits than its factorization.

20041780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91119 (or 91117 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20041780 is about 4476.8046640433. The cubic root of 20041780 is about 271.6306441420.

Adding to 20041780 its reverse (8714002), we get a palindrome (28755782).

The spelling of 20041780 in words is "twenty million, forty-one thousand, seven hundred eighty".