19640475

素因数分解:

$3^5\times 5^2\times {\mathrm{53}}^1\times {\mathrm{61}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 37778832

約数和(自身を除く): 18138357

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 53, 61, 75, 81, 135, 159, 183, 225, 243, 265, 305, 405, 477, 549, 675, 795, 915, 1215, 1325, 1431, 1525, 1647, 2025, 2385, 2745, 3233, 3975, 4293, 4575, 4941, 6075, 7155, 8235, 9699, 11925, 12879, 13725, 14823, 16165, 21465, 24705, 29097, 35775, 41175, 48495, 64395, 74115, 80825, 87291, 107325, 123525, 145485, 242475, 261873, 321975, 370575, 436455, 727425, 785619, 1309365, 2182275, 3928095, 6546825, 19640475]

約数ペア:

[(1, 19640475), (3, 6546825), (5, 3928095), (9, 2182275), (15, 1309365), (25, 785619), (27, 727425), (45, 436455), (53, 370575), (61, 321975), (75, 261873), (81, 242475), (135, 145485), (159, 123525), (183, 107325), (225, 87291), (243, 80825), (265, 74115), (305, 64395), (405, 48495), (477, 41175), (549, 35775), (675, 29097), (795, 24705), (915, 21465), (1215, 16165), (1325, 14823), (1431, 13725), (1525, 12879), (1647, 11925), (2025, 9699), (2385, 8235), (2745, 7155), (3233, 6075), (3975, 4941), (4293, 4575)]