19978120

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{97}}^1\times {\mathrm{271}}^1$

素因数の和:398

約数の個数: 64

約数和(自身を含む): 47980800

約数和(自身を除く): 28002680

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 97, 152, 190, 194, 271, 380, 388, 485, 542, 760, 776, 970, 1084, 1355, 1843, 1940, 2168, 2710, 3686, 3880, 5149, 5420, 7372, 9215, 10298, 10840, 14744, 18430, 20596, 25745, 26287, 36860, 41192, 51490, 52574, 73720, 102980, 105148, 131435, 205960, 210296, 262870, 499453, 525740, 998906, 1051480, 1997812, 2497265, 3995624, 4994530, 9989060, 19978120]

約数ペア:

[(1, 19978120), (2, 9989060), (4, 4994530), (5, 3995624), (8, 2497265), (10, 1997812), (19, 1051480), (20, 998906), (38, 525740), (40, 499453), (76, 262870), (95, 210296), (97, 205960), (152, 131435), (190, 105148), (194, 102980), (271, 73720), (380, 52574), (388, 51490), (485, 41192), (542, 36860), (760, 26287), (776, 25745), (970, 20596), (1084, 18430), (1355, 14744), (1843, 10840), (1940, 10298), (2168, 9215), (2710, 7372), (3686, 5420), (3880, 5149)]