18720975

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{211}}^1$

素因数の和:257

約数の個数: 72

約数和(自身を含む): 38485632

約数和(自身を除く): 19764657

約数列:

[1, 3, 5, 7, 13, 15, 21, 25, 35, 39, 65, 75, 91, 105, 169, 175, 195, 211, 273, 325, 455, 507, 525, 633, 845, 975, 1055, 1183, 1365, 1477, 2275, 2535, 2743, 3165, 3549, 4225, 4431, 5275, 5915, 6825, 7385, 8229, 12675, 13715, 15825, 17745, 19201, 22155, 29575, 35659, 36925, 41145, 57603, 68575, 88725, 96005, 106977, 110775, 178295, 205725, 249613, 288015, 480025, 534885, 748839, 891475, 1248065, 1440075, 2674425, 3744195, 6240325, 18720975]

約数ペア:

[(1, 18720975), (3, 6240325), (5, 3744195), (7, 2674425), (13, 1440075), (15, 1248065), (21, 891475), (25, 748839), (35, 534885), (39, 480025), (65, 288015), (75, 249613), (91, 205725), (105, 178295), (169, 110775), (175, 106977), (195, 96005), (211, 88725), (273, 68575), (325, 57603), (455, 41145), (507, 36925), (525, 35659), (633, 29575), (845, 22155), (975, 19201), (1055, 17745), (1183, 15825), (1365, 13715), (1477, 12675), (2275, 8229), (2535, 7385), (2743, 6825), (3165, 5915), (3549, 5275), (4225, 4431)]