21291764

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 41771520

約数和(自身を除く): 20479756

約数列:

[1, 2, 4, 13, 26, 52, 71, 73, 79, 142, 146, 158, 284, 292, 316, 923, 949, 1027, 1846, 1898, 2054, 3692, 3796, 4108, 5183, 5609, 5767, 10366, 11218, 11534, 20732, 22436, 23068, 67379, 72917, 74971, 134758, 145834, 149942, 269516, 291668, 299884, 409457, 818914, 1637828, 5322941, 10645882, 21291764]

約数ペア:

[(1, 21291764), (2, 10645882), (4, 5322941), (13, 1637828), (26, 818914), (52, 409457), (71, 299884), (73, 291668), (79, 269516), (142, 149942), (146, 145834), (158, 134758), (284, 74971), (292, 72917), (316, 67379), (923, 23068), (949, 22436), (1027, 20732), (1846, 11534), (1898, 11218), (2054, 10366), (3692, 5767), (3796, 5609), (4108, 5183)]