21405020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{619}}^1$

素因数の和:667

約数の個数: 96

約数和(自身を含む): 58329600

約数和(自身を除く): 36924580

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 19, 20, 26, 28, 35, 38, 52, 65, 70, 76, 91, 95, 130, 133, 140, 182, 190, 247, 260, 266, 364, 380, 455, 494, 532, 619, 665, 910, 988, 1235, 1238, 1330, 1729, 1820, 2470, 2476, 2660, 3095, 3458, 4333, 4940, 6190, 6916, 8047, 8645, 8666, 11761, 12380, 16094, 17290, 17332, 21665, 23522, 32188, 34580, 40235, 43330, 47044, 56329, 58805, 80470, 82327, 86660, 112658, 117610, 152893, 160940, 164654, 225316, 235220, 281645, 305786, 329308, 411635, 563290, 611572, 764465, 823270, 1070251, 1126580, 1528930, 1646540, 2140502, 3057860, 4281004, 5351255, 10702510, 21405020]

約数ペア:

[(1, 21405020), (2, 10702510), (4, 5351255), (5, 4281004), (7, 3057860), (10, 2140502), (13, 1646540), (14, 1528930), (19, 1126580), (20, 1070251), (26, 823270), (28, 764465), (35, 611572), (38, 563290), (52, 411635), (65, 329308), (70, 305786), (76, 281645), (91, 235220), (95, 225316), (130, 164654), (133, 160940), (140, 152893), (182, 117610), (190, 112658), (247, 86660), (260, 82327), (266, 80470), (364, 58805), (380, 56329), (455, 47044), (494, 43330), (532, 40235), (619, 34580), (665, 32188), (910, 23522), (988, 21665), (1235, 17332), (1238, 17290), (1330, 16094), (1729, 12380), (1820, 11761), (2470, 8666), (2476, 8645), (2660, 8047), (3095, 6916), (3458, 6190), (4333, 4940)]