21871980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{719}}^1$

素因数の和:760

約数の個数: 108

約数和(自身を含む): 71940960

約数和(自身を除く): 50068980

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 18, 20, 26, 30, 36, 39, 45, 52, 60, 65, 78, 90, 117, 130, 156, 169, 180, 195, 234, 260, 338, 390, 468, 507, 585, 676, 719, 780, 845, 1014, 1170, 1438, 1521, 1690, 2028, 2157, 2340, 2535, 2876, 3042, 3380, 3595, 4314, 5070, 6084, 6471, 7190, 7605, 8628, 9347, 10140, 10785, 12942, 14380, 15210, 18694, 21570, 25884, 28041, 30420, 32355, 37388, 43140, 46735, 56082, 64710, 84123, 93470, 112164, 121511, 129420, 140205, 168246, 186940, 243022, 280410, 336492, 364533, 420615, 486044, 560820, 607555, 729066, 841230, 1093599, 1215110, 1458132, 1682460, 1822665, 2187198, 2430220, 3645330, 4374396, 5467995, 7290660, 10935990, 21871980]

約数ペア:

[(1, 21871980), (2, 10935990), (3, 7290660), (4, 5467995), (5, 4374396), (6, 3645330), (9, 2430220), (10, 2187198), (12, 1822665), (13, 1682460), (15, 1458132), (18, 1215110), (20, 1093599), (26, 841230), (30, 729066), (36, 607555), (39, 560820), (45, 486044), (52, 420615), (60, 364533), (65, 336492), (78, 280410), (90, 243022), (117, 186940), (130, 168246), (156, 140205), (169, 129420), (180, 121511), (195, 112164), (234, 93470), (260, 84123), (338, 64710), (390, 56082), (468, 46735), (507, 43140), (585, 37388), (676, 32355), (719, 30420), (780, 28041), (845, 25884), (1014, 21570), (1170, 18694), (1438, 15210), (1521, 14380), (1690, 12942), (2028, 10785), (2157, 10140), (2340, 9347), (2535, 8628), (2876, 7605), (3042, 7190), (3380, 6471), (3595, 6084), (4314, 5070)]