20361880 has 96 divisors (see below), whose sum is σ = 57647520. Its totient is φ = 6336000.

The previous prime is 20361851. The next prime is 20361889. The reversal of 20361880 is 8816302.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33580 + ... + 34180.

It is an arithmetic number, because the mean of its divisors is an integer number (600495).

Almost surely, 2^20361880 is an apocalyptic number.

20361880 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 20361880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28823760).

20361880 is an abundant number, since it is smaller than the sum of its proper divisors (37285640).

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

20361880 is a wasteful number, since it uses less digits than its factorization.

20361880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20361880 is about 4512.4139880999. The cubic root of 20361880 is about 273.0691412490.

It can be divided in two parts, 2036 and 1880, that added together give a triangular number (3916 = T₈₈).

The spelling of 20361880 in words is "twenty million, three hundred sixty-one thousand, eight hundred eighty".