19978400

素因数分解:

$2^5\times 5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{113}}^1$

素因数の和:163

約数の個数: 144

約数和(自身を含む): 56105784

約数和(自身を除く): 36127384

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 25, 26, 32, 34, 40, 50, 52, 65, 68, 80, 85, 100, 104, 113, 130, 136, 160, 170, 200, 208, 221, 226, 260, 272, 325, 340, 400, 416, 425, 442, 452, 520, 544, 565, 650, 680, 800, 850, 884, 904, 1040, 1105, 1130, 1300, 1360, 1469, 1700, 1768, 1808, 1921, 2080, 2210, 2260, 2600, 2720, 2825, 2938, 3400, 3536, 3616, 3842, 4420, 4520, 5200, 5525, 5650, 5876, 6800, 7072, 7345, 7684, 8840, 9040, 9605, 10400, 11050, 11300, 11752, 13600, 14690, 15368, 17680, 18080, 19210, 22100, 22600, 23504, 24973, 29380, 30736, 35360, 36725, 38420, 44200, 45200, 47008, 48025, 49946, 58760, 61472, 73450, 76840, 88400, 90400, 96050, 99892, 117520, 124865, 146900, 153680, 176800, 192100, 199784, 235040, 249730, 293800, 307360, 384200, 399568, 499460, 587600, 624325, 768400, 799136, 998920, 1175200, 1248650, 1536800, 1997840, 2497300, 3995680, 4994600, 9989200, 19978400]

約数ペア:

[(1, 19978400), (2, 9989200), (4, 4994600), (5, 3995680), (8, 2497300), (10, 1997840), (13, 1536800), (16, 1248650), (17, 1175200), (20, 998920), (25, 799136), (26, 768400), (32, 624325), (34, 587600), (40, 499460), (50, 399568), (52, 384200), (65, 307360), (68, 293800), (80, 249730), (85, 235040), (100, 199784), (104, 192100), (113, 176800), (130, 153680), (136, 146900), (160, 124865), (170, 117520), (200, 99892), (208, 96050), (221, 90400), (226, 88400), (260, 76840), (272, 73450), (325, 61472), (340, 58760), (400, 49946), (416, 48025), (425, 47008), (442, 45200), (452, 44200), (520, 38420), (544, 36725), (565, 35360), (650, 30736), (680, 29380), (800, 24973), (850, 23504), (884, 22600), (904, 22100), (1040, 19210), (1105, 18080), (1130, 17680), (1300, 15368), (1360, 14690), (1469, 13600), (1700, 11752), (1768, 11300), (1808, 11050), (1921, 10400), (2080, 9605), (2210, 9040), (2260, 8840), (2600, 7684), (2720, 7345), (2825, 7072), (2938, 6800), (3400, 5876), (3536, 5650), (3616, 5525), (3842, 5200), (4420, 4520)]