21680520

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{257}}^1$

素因数の和:327

約数の個数: 128

約数和(自身を含む): 70588800

約数和(自身を除く): 48908280

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 19, 20, 24, 30, 37, 38, 40, 57, 60, 74, 76, 95, 111, 114, 120, 148, 152, 185, 190, 222, 228, 257, 285, 296, 370, 380, 444, 456, 514, 555, 570, 703, 740, 760, 771, 888, 1028, 1110, 1140, 1285, 1406, 1480, 1542, 2056, 2109, 2220, 2280, 2570, 2812, 3084, 3515, 3855, 4218, 4440, 4883, 5140, 5624, 6168, 7030, 7710, 8436, 9509, 9766, 10280, 10545, 14060, 14649, 15420, 16872, 19018, 19532, 21090, 24415, 28120, 28527, 29298, 30840, 38036, 39064, 42180, 47545, 48830, 57054, 58596, 73245, 76072, 84360, 95090, 97660, 114108, 117192, 142635, 146490, 180671, 190180, 195320, 228216, 285270, 292980, 361342, 380360, 542013, 570540, 585960, 722684, 903355, 1084026, 1141080, 1445368, 1806710, 2168052, 2710065, 3613420, 4336104, 5420130, 7226840, 10840260, 21680520]

約数ペア:

[(1, 21680520), (2, 10840260), (3, 7226840), (4, 5420130), (5, 4336104), (6, 3613420), (8, 2710065), (10, 2168052), (12, 1806710), (15, 1445368), (19, 1141080), (20, 1084026), (24, 903355), (30, 722684), (37, 585960), (38, 570540), (40, 542013), (57, 380360), (60, 361342), (74, 292980), (76, 285270), (95, 228216), (111, 195320), (114, 190180), (120, 180671), (148, 146490), (152, 142635), (185, 117192), (190, 114108), (222, 97660), (228, 95090), (257, 84360), (285, 76072), (296, 73245), (370, 58596), (380, 57054), (444, 48830), (456, 47545), (514, 42180), (555, 39064), (570, 38036), (703, 30840), (740, 29298), (760, 28527), (771, 28120), (888, 24415), (1028, 21090), (1110, 19532), (1140, 19018), (1285, 16872), (1406, 15420), (1480, 14649), (1542, 14060), (2056, 10545), (2109, 10280), (2220, 9766), (2280, 9509), (2570, 8436), (2812, 7710), (3084, 7030), (3515, 6168), (3855, 5624), (4218, 5140), (4440, 4883)]