20720355

素因数分解:

$3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{109}}^1$

素因数の和:188

約数の個数: 64

約数和(自身を含む): 38016000

約数和(自身を除く): 17295645

約数列:

[1, 3, 5, 15, 19, 23, 29, 57, 69, 87, 95, 109, 115, 145, 285, 327, 345, 435, 437, 545, 551, 667, 1311, 1635, 1653, 2001, 2071, 2185, 2507, 2755, 3161, 3335, 6213, 6555, 7521, 8265, 9483, 10005, 10355, 12535, 12673, 15805, 31065, 37605, 38019, 47415, 47633, 60059, 63365, 72703, 142899, 180177, 190095, 218109, 238165, 300295, 363515, 714495, 900885, 1090545, 1381357, 4144071, 6906785, 20720355]

約数ペア:

[(1, 20720355), (3, 6906785), (5, 4144071), (15, 1381357), (19, 1090545), (23, 900885), (29, 714495), (57, 363515), (69, 300295), (87, 238165), (95, 218109), (109, 190095), (115, 180177), (145, 142899), (285, 72703), (327, 63365), (345, 60059), (435, 47633), (437, 47415), (545, 38019), (551, 37605), (667, 31065), (1311, 15805), (1635, 12673), (1653, 12535), (2001, 10355), (2071, 10005), (2185, 9483), (2507, 8265), (2755, 7521), (3161, 6555), (3335, 6213)]