19780000

素因数分解:

$2^5\times 5^4\times {\mathrm{23}}^1\times {\mathrm{43}}^1$

素因数の和:96

約数の個数: 120

約数和(自身を含む): 51958368

約数和(自身を除く): 32178368

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 25, 32, 40, 43, 46, 50, 80, 86, 92, 100, 115, 125, 160, 172, 184, 200, 215, 230, 250, 344, 368, 400, 430, 460, 500, 575, 625, 688, 736, 800, 860, 920, 989, 1000, 1075, 1150, 1250, 1376, 1720, 1840, 1978, 2000, 2150, 2300, 2500, 2875, 3440, 3680, 3956, 4000, 4300, 4600, 4945, 5000, 5375, 5750, 6880, 7912, 8600, 9200, 9890, 10000, 10750, 11500, 14375, 15824, 17200, 18400, 19780, 20000, 21500, 23000, 24725, 26875, 28750, 31648, 34400, 39560, 43000, 46000, 49450, 53750, 57500, 79120, 86000, 92000, 98900, 107500, 115000, 123625, 158240, 172000, 197800, 215000, 230000, 247250, 395600, 430000, 460000, 494500, 618125, 791200, 860000, 989000, 1236250, 1978000, 2472500, 3956000, 4945000, 9890000, 19780000]

約数ペア:

[(1, 19780000), (2, 9890000), (4, 4945000), (5, 3956000), (8, 2472500), (10, 1978000), (16, 1236250), (20, 989000), (23, 860000), (25, 791200), (32, 618125), (40, 494500), (43, 460000), (46, 430000), (50, 395600), (80, 247250), (86, 230000), (92, 215000), (100, 197800), (115, 172000), (125, 158240), (160, 123625), (172, 115000), (184, 107500), (200, 98900), (215, 92000), (230, 86000), (250, 79120), (344, 57500), (368, 53750), (400, 49450), (430, 46000), (460, 43000), (500, 39560), (575, 34400), (625, 31648), (688, 28750), (736, 26875), (800, 24725), (860, 23000), (920, 21500), (989, 20000), (1000, 19780), (1075, 18400), (1150, 17200), (1250, 15824), (1376, 14375), (1720, 11500), (1840, 10750), (1978, 10000), (2000, 9890), (2150, 9200), (2300, 8600), (2500, 7912), (2875, 6880), (3440, 5750), (3680, 5375), (3956, 5000), (4000, 4945), (4300, 4600)]