21354040

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{1013}}^1$

素因数の和:1072

約数の個数: 64

約数和(自身を含む): 52565760

約数和(自身を除く): 31211720

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 1013, 1054, 1240, 2026, 2108, 2635, 4052, 4216, 5065, 5270, 8104, 10130, 10540, 17221, 20260, 21080, 31403, 34442, 40520, 62806, 68884, 86105, 125612, 137768, 157015, 172210, 251224, 314030, 344420, 533851, 628060, 688840, 1067702, 1256120, 2135404, 2669255, 4270808, 5338510, 10677020, 21354040]

約数ペア:

[(1, 21354040), (2, 10677020), (4, 5338510), (5, 4270808), (8, 2669255), (10, 2135404), (17, 1256120), (20, 1067702), (31, 688840), (34, 628060), (40, 533851), (62, 344420), (68, 314030), (85, 251224), (124, 172210), (136, 157015), (155, 137768), (170, 125612), (248, 86105), (310, 68884), (340, 62806), (527, 40520), (620, 34442), (680, 31403), (1013, 21080), (1054, 20260), (1240, 17221), (2026, 10540), (2108, 10130), (2635, 8104), (4052, 5270), (4216, 5065)]