20921900

素因数分解:

$2^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{397}}^1$

素因数の和:459

約数の個数: 72

約数和(自身を含む): 49746816

約数和(自身を除く): 28824916

約数列:

[1, 2, 4, 5, 10, 17, 20, 25, 31, 34, 50, 62, 68, 85, 100, 124, 155, 170, 310, 340, 397, 425, 527, 620, 775, 794, 850, 1054, 1550, 1588, 1700, 1985, 2108, 2635, 3100, 3970, 5270, 6749, 7940, 9925, 10540, 12307, 13175, 13498, 19850, 24614, 26350, 26996, 33745, 39700, 49228, 52700, 61535, 67490, 123070, 134980, 168725, 209219, 246140, 307675, 337450, 418438, 615350, 674900, 836876, 1046095, 1230700, 2092190, 4184380, 5230475, 10460950, 20921900]

約数ペア:

[(1, 20921900), (2, 10460950), (4, 5230475), (5, 4184380), (10, 2092190), (17, 1230700), (20, 1046095), (25, 836876), (31, 674900), (34, 615350), (50, 418438), (62, 337450), (68, 307675), (85, 246140), (100, 209219), (124, 168725), (155, 134980), (170, 123070), (310, 67490), (340, 61535), (397, 52700), (425, 49228), (527, 39700), (620, 33745), (775, 26996), (794, 26350), (850, 24614), (1054, 19850), (1550, 13498), (1588, 13175), (1700, 12307), (1985, 10540), (2108, 9925), (2635, 7940), (3100, 6749), (3970, 5270)]