20984740

素因数分解:

$2^2\times 5^1\times 7^4\times {\mathrm{19}}^1\times {\mathrm{23}}^1$

素因数の和:79

約数の個数: 120

約数和(自身を含む): 56468160

約数和(自身を除く): 35483420

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 23, 28, 35, 38, 46, 49, 70, 76, 92, 95, 98, 115, 133, 140, 161, 190, 196, 230, 245, 266, 322, 343, 380, 437, 460, 490, 532, 644, 665, 686, 805, 874, 931, 980, 1127, 1330, 1372, 1610, 1715, 1748, 1862, 2185, 2254, 2401, 2660, 3059, 3220, 3430, 3724, 4370, 4508, 4655, 4802, 5635, 6118, 6517, 6860, 7889, 8740, 9310, 9604, 11270, 12005, 12236, 13034, 15295, 15778, 18620, 21413, 22540, 24010, 26068, 30590, 31556, 32585, 39445, 42826, 45619, 48020, 55223, 61180, 65170, 78890, 85652, 91238, 107065, 110446, 130340, 149891, 157780, 182476, 214130, 220892, 228095, 276115, 299782, 428260, 456190, 552230, 599564, 749455, 912380, 1049237, 1104460, 1498910, 2098474, 2997820, 4196948, 5246185, 10492370, 20984740]

約数ペア:

[(1, 20984740), (2, 10492370), (4, 5246185), (5, 4196948), (7, 2997820), (10, 2098474), (14, 1498910), (19, 1104460), (20, 1049237), (23, 912380), (28, 749455), (35, 599564), (38, 552230), (46, 456190), (49, 428260), (70, 299782), (76, 276115), (92, 228095), (95, 220892), (98, 214130), (115, 182476), (133, 157780), (140, 149891), (161, 130340), (190, 110446), (196, 107065), (230, 91238), (245, 85652), (266, 78890), (322, 65170), (343, 61180), (380, 55223), (437, 48020), (460, 45619), (490, 42826), (532, 39445), (644, 32585), (665, 31556), (686, 30590), (805, 26068), (874, 24010), (931, 22540), (980, 21413), (1127, 18620), (1330, 15778), (1372, 15295), (1610, 13034), (1715, 12236), (1748, 12005), (1862, 11270), (2185, 9604), (2254, 9310), (2401, 8740), (2660, 7889), (3059, 6860), (3220, 6517), (3430, 6118), (3724, 5635), (4370, 4802), (4508, 4655)]