81201820

素因数分解:

$2^2\times 5^1\times 7^4\times {\mathrm{19}}^1\times {\mathrm{89}}^1$

素因数の和:145

約数の個数: 120

約数和(自身を含む): 211755600

約数和(自身を除く): 130553780

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 49, 70, 76, 89, 95, 98, 133, 140, 178, 190, 196, 245, 266, 343, 356, 380, 445, 490, 532, 623, 665, 686, 890, 931, 980, 1246, 1330, 1372, 1691, 1715, 1780, 1862, 2401, 2492, 2660, 3115, 3382, 3430, 3724, 4361, 4655, 4802, 6230, 6517, 6764, 6860, 8455, 8722, 9310, 9604, 11837, 12005, 12460, 13034, 16910, 17444, 18620, 21805, 23674, 24010, 26068, 30527, 32585, 33820, 43610, 45619, 47348, 48020, 59185, 61054, 65170, 82859, 87220, 91238, 118370, 122108, 130340, 152635, 165718, 182476, 213689, 228095, 236740, 305270, 331436, 414295, 427378, 456190, 580013, 610540, 828590, 854756, 912380, 1068445, 1160026, 1657180, 2136890, 2320052, 2900065, 4060091, 4273780, 5800130, 8120182, 11600260, 16240364, 20300455, 40600910, 81201820]

約数ペア:

[(1, 81201820), (2, 40600910), (4, 20300455), (5, 16240364), (7, 11600260), (10, 8120182), (14, 5800130), (19, 4273780), (20, 4060091), (28, 2900065), (35, 2320052), (38, 2136890), (49, 1657180), (70, 1160026), (76, 1068445), (89, 912380), (95, 854756), (98, 828590), (133, 610540), (140, 580013), (178, 456190), (190, 427378), (196, 414295), (245, 331436), (266, 305270), (343, 236740), (356, 228095), (380, 213689), (445, 182476), (490, 165718), (532, 152635), (623, 130340), (665, 122108), (686, 118370), (890, 91238), (931, 87220), (980, 82859), (1246, 65170), (1330, 61054), (1372, 59185), (1691, 48020), (1715, 47348), (1780, 45619), (1862, 43610), (2401, 33820), (2492, 32585), (2660, 30527), (3115, 26068), (3382, 24010), (3430, 23674), (3724, 21805), (4361, 18620), (4655, 17444), (4802, 16910), (6230, 13034), (6517, 12460), (6764, 12005), (6860, 11837), (8455, 9604), (8722, 9310)]