20938840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{601}}^1$

素因数の和:692

約数の個数: 64

約数和(自身を含む): 51579360

約数和(自身を除く): 30640520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 67, 104, 130, 134, 260, 268, 335, 520, 536, 601, 670, 871, 1202, 1340, 1742, 2404, 2680, 3005, 3484, 4355, 4808, 6010, 6968, 7813, 8710, 12020, 15626, 17420, 24040, 31252, 34840, 39065, 40267, 62504, 78130, 80534, 156260, 161068, 201335, 312520, 322136, 402670, 523471, 805340, 1046942, 1610680, 2093884, 2617355, 4187768, 5234710, 10469420, 20938840]

約数ペア:

[(1, 20938840), (2, 10469420), (4, 5234710), (5, 4187768), (8, 2617355), (10, 2093884), (13, 1610680), (20, 1046942), (26, 805340), (40, 523471), (52, 402670), (65, 322136), (67, 312520), (104, 201335), (130, 161068), (134, 156260), (260, 80534), (268, 78130), (335, 62504), (520, 40267), (536, 39065), (601, 34840), (670, 31252), (871, 24040), (1202, 17420), (1340, 15626), (1742, 12020), (2404, 8710), (2680, 7813), (3005, 6968), (3484, 6010), (4355, 4808)]