21891980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{151}}^1\times {\mathrm{659}}^1$

素因数の和:830

約数の個数: 48

約数和(自身を含む): 50561280

約数和(自身を除く): 28669300

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 151, 220, 302, 604, 659, 755, 1318, 1510, 1661, 2636, 3020, 3295, 3322, 6590, 6644, 7249, 8305, 13180, 14498, 16610, 28996, 33220, 36245, 72490, 99509, 144980, 199018, 398036, 497545, 995090, 1094599, 1990180, 2189198, 4378396, 5472995, 10945990, 21891980]

約数ペア:

[(1, 21891980), (2, 10945990), (4, 5472995), (5, 4378396), (10, 2189198), (11, 1990180), (20, 1094599), (22, 995090), (44, 497545), (55, 398036), (110, 199018), (151, 144980), (220, 99509), (302, 72490), (604, 36245), (659, 33220), (755, 28996), (1318, 16610), (1510, 14498), (1661, 13180), (2636, 8305), (3020, 7249), (3295, 6644), (3322, 6590)]