20561840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1163}}^1$

素因数の和:1206

約数の個数: 80

約数和(自身を含む): 54559008

約数和(自身を除く): 33997168

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 26, 34, 40, 52, 65, 68, 80, 85, 104, 130, 136, 170, 208, 221, 260, 272, 340, 442, 520, 680, 884, 1040, 1105, 1163, 1360, 1768, 2210, 2326, 3536, 4420, 4652, 5815, 8840, 9304, 11630, 15119, 17680, 18608, 19771, 23260, 30238, 39542, 46520, 60476, 75595, 79084, 93040, 98855, 120952, 151190, 158168, 197710, 241904, 257023, 302380, 316336, 395420, 514046, 604760, 790840, 1028092, 1209520, 1285115, 1581680, 2056184, 2570230, 4112368, 5140460, 10280920, 20561840]

約数ペア:

[(1, 20561840), (2, 10280920), (4, 5140460), (5, 4112368), (8, 2570230), (10, 2056184), (13, 1581680), (16, 1285115), (17, 1209520), (20, 1028092), (26, 790840), (34, 604760), (40, 514046), (52, 395420), (65, 316336), (68, 302380), (80, 257023), (85, 241904), (104, 197710), (130, 158168), (136, 151190), (170, 120952), (208, 98855), (221, 93040), (260, 79084), (272, 75595), (340, 60476), (442, 46520), (520, 39542), (680, 30238), (884, 23260), (1040, 19771), (1105, 18608), (1163, 17680), (1360, 15119), (1768, 11630), (2210, 9304), (2326, 8840), (3536, 5815), (4420, 4652)]