21508893

素因数分解:

$3^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{151}}^1$

素因数の和:207

約数の個数: 72

約数和(自身を含む): 40547520

約数和(自身を除く): 19038627

約数列:

[1, 3, 7, 9, 17, 19, 21, 49, 51, 57, 63, 119, 133, 147, 151, 153, 171, 323, 357, 399, 441, 453, 833, 931, 969, 1057, 1071, 1197, 1359, 2261, 2499, 2567, 2793, 2869, 2907, 3171, 6783, 7399, 7497, 7701, 8379, 8607, 9513, 15827, 17969, 20083, 20349, 22197, 23103, 25821, 47481, 48773, 53907, 60249, 66591, 125783, 140581, 142443, 146319, 161721, 180747, 341411, 377349, 421743, 438957, 1024233, 1132047, 1265229, 2389877, 3072699, 7169631, 21508893]

約数ペア:

[(1, 21508893), (3, 7169631), (7, 3072699), (9, 2389877), (17, 1265229), (19, 1132047), (21, 1024233), (49, 438957), (51, 421743), (57, 377349), (63, 341411), (119, 180747), (133, 161721), (147, 146319), (151, 142443), (153, 140581), (171, 125783), (323, 66591), (357, 60249), (399, 53907), (441, 48773), (453, 47481), (833, 25821), (931, 23103), (969, 22197), (1057, 20349), (1071, 20083), (1197, 17969), (1359, 15827), (2261, 9513), (2499, 8607), (2567, 8379), (2793, 7701), (2869, 7497), (2907, 7399), (3171, 6783)]