19857940

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{397}}^1$

素因数の和:508

約数の個数: 48

約数和(自身を含む): 43528464

約数和(自身を除く): 23670524

約数列:

[1, 2, 4, 5, 10, 20, 41, 61, 82, 122, 164, 205, 244, 305, 397, 410, 610, 794, 820, 1220, 1588, 1985, 2501, 3970, 5002, 7940, 10004, 12505, 16277, 24217, 25010, 32554, 48434, 50020, 65108, 81385, 96868, 121085, 162770, 242170, 325540, 484340, 992897, 1985794, 3971588, 4964485, 9928970, 19857940]

約数ペア:

[(1, 19857940), (2, 9928970), (4, 4964485), (5, 3971588), (10, 1985794), (20, 992897), (41, 484340), (61, 325540), (82, 242170), (122, 162770), (164, 121085), (205, 96868), (244, 81385), (305, 65108), (397, 50020), (410, 48434), (610, 32554), (794, 25010), (820, 24217), (1220, 16277), (1588, 12505), (1985, 10004), (2501, 7940), (3970, 5002)]