21206920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{89}}^1$

素因数の和:167

約数の個数: 128

約数和(自身を含む): 59097600

約数和(自身を除く): 37890680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 23, 28, 35, 37, 40, 46, 56, 70, 74, 89, 92, 115, 140, 148, 161, 178, 184, 185, 230, 259, 280, 296, 322, 356, 370, 445, 460, 518, 623, 644, 712, 740, 805, 851, 890, 920, 1036, 1246, 1288, 1295, 1480, 1610, 1702, 1780, 2047, 2072, 2492, 2590, 3115, 3220, 3293, 3404, 3560, 4094, 4255, 4984, 5180, 5957, 6230, 6440, 6586, 6808, 8188, 8510, 10235, 10360, 11914, 12460, 13172, 14329, 16376, 16465, 17020, 20470, 23051, 23828, 24920, 26344, 28658, 29785, 32930, 34040, 40940, 46102, 47656, 57316, 59570, 65860, 71645, 75739, 81880, 92204, 114632, 115255, 119140, 131720, 143290, 151478, 184408, 230510, 238280, 286580, 302956, 378695, 461020, 530173, 573160, 605912, 757390, 922040, 1060346, 1514780, 2120692, 2650865, 3029560, 4241384, 5301730, 10603460, 21206920]

約数ペア:

[(1, 21206920), (2, 10603460), (4, 5301730), (5, 4241384), (7, 3029560), (8, 2650865), (10, 2120692), (14, 1514780), (20, 1060346), (23, 922040), (28, 757390), (35, 605912), (37, 573160), (40, 530173), (46, 461020), (56, 378695), (70, 302956), (74, 286580), (89, 238280), (92, 230510), (115, 184408), (140, 151478), (148, 143290), (161, 131720), (178, 119140), (184, 115255), (185, 114632), (230, 92204), (259, 81880), (280, 75739), (296, 71645), (322, 65860), (356, 59570), (370, 57316), (445, 47656), (460, 46102), (518, 40940), (623, 34040), (644, 32930), (712, 29785), (740, 28658), (805, 26344), (851, 24920), (890, 23828), (920, 23051), (1036, 20470), (1246, 17020), (1288, 16465), (1295, 16376), (1480, 14329), (1610, 13172), (1702, 12460), (1780, 11914), (2047, 10360), (2072, 10235), (2492, 8510), (2590, 8188), (3115, 6808), (3220, 6586), (3293, 6440), (3404, 6230), (3560, 5957), (4094, 5180), (4255, 4984)]