21980920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1031}}^1$

素因数の和:1096

約数の個数: 64

約数和(自身を含む): 54613440

約数和(自身を除く): 32632520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 41, 52, 65, 82, 104, 130, 164, 205, 260, 328, 410, 520, 533, 820, 1031, 1066, 1640, 2062, 2132, 2665, 4124, 4264, 5155, 5330, 8248, 10310, 10660, 13403, 20620, 21320, 26806, 41240, 42271, 53612, 67015, 84542, 107224, 134030, 169084, 211355, 268060, 338168, 422710, 536120, 549523, 845420, 1099046, 1690840, 2198092, 2747615, 4396184, 5495230, 10990460, 21980920]

約数ペア:

[(1, 21980920), (2, 10990460), (4, 5495230), (5, 4396184), (8, 2747615), (10, 2198092), (13, 1690840), (20, 1099046), (26, 845420), (40, 549523), (41, 536120), (52, 422710), (65, 338168), (82, 268060), (104, 211355), (130, 169084), (164, 134030), (205, 107224), (260, 84542), (328, 67015), (410, 53612), (520, 42271), (533, 41240), (820, 26806), (1031, 21320), (1066, 20620), (1640, 13403), (2062, 10660), (2132, 10310), (2665, 8248), (4124, 5330), (4264, 5155)]