20991564

素因数分解:

$2^2\times 3^2\times {\mathrm{11}}^2\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:172

約数の個数: 108

約数和(自身を含む): 60030880

約数和(自身を除く): 39039316

約数列:

[1, 2, 3, 4, 6, 9, 11, 12, 18, 22, 33, 36, 44, 61, 66, 79, 99, 121, 122, 132, 158, 183, 198, 237, 242, 244, 316, 363, 366, 396, 474, 484, 549, 671, 711, 726, 732, 869, 948, 1089, 1098, 1342, 1422, 1452, 1738, 2013, 2178, 2196, 2607, 2684, 2844, 3476, 4026, 4356, 4819, 5214, 6039, 7381, 7821, 8052, 9559, 9638, 10428, 12078, 14457, 14762, 15642, 19118, 19276, 22143, 24156, 28677, 28914, 29524, 31284, 38236, 43371, 44286, 53009, 57354, 57828, 66429, 86031, 86742, 88572, 106018, 114708, 132858, 159027, 172062, 173484, 212036, 265716, 318054, 344124, 477081, 583099, 636108, 954162, 1166198, 1749297, 1908324, 2332396, 3498594, 5247891, 6997188, 10495782, 20991564]

約数ペア:

[(1, 20991564), (2, 10495782), (3, 6997188), (4, 5247891), (6, 3498594), (9, 2332396), (11, 1908324), (12, 1749297), (18, 1166198), (22, 954162), (33, 636108), (36, 583099), (44, 477081), (61, 344124), (66, 318054), (79, 265716), (99, 212036), (121, 173484), (122, 172062), (132, 159027), (158, 132858), (183, 114708), (198, 106018), (237, 88572), (242, 86742), (244, 86031), (316, 66429), (363, 57828), (366, 57354), (396, 53009), (474, 44286), (484, 43371), (549, 38236), (671, 31284), (711, 29524), (726, 28914), (732, 28677), (869, 24156), (948, 22143), (1089, 19276), (1098, 19118), (1342, 15642), (1422, 14762), (1452, 14457), (1738, 12078), (2013, 10428), (2178, 9638), (2196, 9559), (2607, 8052), (2684, 7821), (2844, 7381), (3476, 6039), (4026, 5214), (4356, 4819)]