18941720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{1109}}^1$

素因数の和:1188

約数の個数: 64

約数和(自身を含む): 49550400

約数和(自身を除く): 30608680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 61, 70, 122, 140, 244, 280, 305, 427, 488, 610, 854, 1109, 1220, 1708, 2135, 2218, 2440, 3416, 4270, 4436, 5545, 7763, 8540, 8872, 11090, 15526, 17080, 22180, 31052, 38815, 44360, 62104, 67649, 77630, 135298, 155260, 270596, 310520, 338245, 473543, 541192, 676490, 947086, 1352980, 1894172, 2367715, 2705960, 3788344, 4735430, 9470860, 18941720]

約数ペア:

[(1, 18941720), (2, 9470860), (4, 4735430), (5, 3788344), (7, 2705960), (8, 2367715), (10, 1894172), (14, 1352980), (20, 947086), (28, 676490), (35, 541192), (40, 473543), (56, 338245), (61, 310520), (70, 270596), (122, 155260), (140, 135298), (244, 77630), (280, 67649), (305, 62104), (427, 44360), (488, 38815), (610, 31052), (854, 22180), (1109, 17080), (1220, 15526), (1708, 11090), (2135, 8872), (2218, 8540), (2440, 7763), (3416, 5545), (4270, 4436)]