21381308

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^2\times {\mathrm{67}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 45701712

約数和(自身を除く): 24320404

約数列:

[1, 2, 4, 13, 17, 19, 26, 34, 38, 52, 67, 68, 76, 134, 221, 247, 268, 323, 361, 442, 494, 646, 722, 871, 884, 988, 1139, 1273, 1292, 1444, 1742, 2278, 2546, 3484, 4199, 4556, 4693, 5092, 6137, 8398, 9386, 12274, 14807, 16549, 16796, 18772, 21641, 24187, 24548, 29614, 33098, 43282, 48374, 59228, 66196, 79781, 86564, 96748, 159562, 281333, 314431, 319124, 411179, 562666, 628862, 822358, 1125332, 1257724, 1644716, 5345327, 10690654, 21381308]

約数ペア:

[(1, 21381308), (2, 10690654), (4, 5345327), (13, 1644716), (17, 1257724), (19, 1125332), (26, 822358), (34, 628862), (38, 562666), (52, 411179), (67, 319124), (68, 314431), (76, 281333), (134, 159562), (221, 96748), (247, 86564), (268, 79781), (323, 66196), (361, 59228), (442, 48374), (494, 43282), (646, 33098), (722, 29614), (871, 24548), (884, 24187), (988, 21641), (1139, 18772), (1273, 16796), (1292, 16549), (1444, 14807), (1742, 12274), (2278, 9386), (2546, 8398), (3484, 6137), (4199, 5092), (4556, 4693)]