21338860

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{491}}^1$

素因数の和:594

約数の個数: 48

約数和(自身を含む): 46865952

約数和(自身を除く): 25527092

約数列:

[1, 2, 4, 5, 10, 20, 41, 53, 82, 106, 164, 205, 212, 265, 410, 491, 530, 820, 982, 1060, 1964, 2173, 2455, 4346, 4910, 8692, 9820, 10865, 20131, 21730, 26023, 40262, 43460, 52046, 80524, 100655, 104092, 130115, 201310, 260230, 402620, 520460, 1066943, 2133886, 4267772, 5334715, 10669430, 21338860]

約数ペア:

[(1, 21338860), (2, 10669430), (4, 5334715), (5, 4267772), (10, 2133886), (20, 1066943), (41, 520460), (53, 402620), (82, 260230), (106, 201310), (164, 130115), (205, 104092), (212, 100655), (265, 80524), (410, 52046), (491, 43460), (530, 40262), (820, 26023), (982, 21730), (1060, 20131), (1964, 10865), (2173, 9820), (2455, 8692), (4346, 4910)]