21141640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{373}}^1$

素因数の和:506

約数の個数: 64

約数和(自身を含む): 51836400

約数和(自身を除く): 30694760

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 109, 130, 218, 260, 373, 436, 520, 545, 746, 872, 1090, 1417, 1492, 1865, 2180, 2834, 2984, 3730, 4360, 4849, 5668, 7085, 7460, 9698, 11336, 14170, 14920, 19396, 24245, 28340, 38792, 40657, 48490, 56680, 81314, 96980, 162628, 193960, 203285, 325256, 406570, 528541, 813140, 1057082, 1626280, 2114164, 2642705, 4228328, 5285410, 10570820, 21141640]

約数ペア:

[(1, 21141640), (2, 10570820), (4, 5285410), (5, 4228328), (8, 2642705), (10, 2114164), (13, 1626280), (20, 1057082), (26, 813140), (40, 528541), (52, 406570), (65, 325256), (104, 203285), (109, 193960), (130, 162628), (218, 96980), (260, 81314), (373, 56680), (436, 48490), (520, 40657), (545, 38792), (746, 28340), (872, 24245), (1090, 19396), (1417, 14920), (1492, 14170), (1865, 11336), (2180, 9698), (2834, 7460), (2984, 7085), (3730, 5668), (4360, 4849)]