19809720

素因数分解:

$2^3\times 3^2\times 5^1\times 7^2\times {\mathrm{1123}}^1$

素因数の和:1154

約数の個数: 144

約数和(自身を含む): 74959560

約数和(自身を除く): 55149840

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 21, 24, 28, 30, 35, 36, 40, 42, 45, 49, 56, 60, 63, 70, 72, 84, 90, 98, 105, 120, 126, 140, 147, 168, 180, 196, 210, 245, 252, 280, 294, 315, 360, 392, 420, 441, 490, 504, 588, 630, 735, 840, 882, 980, 1123, 1176, 1260, 1470, 1764, 1960, 2205, 2246, 2520, 2940, 3369, 3528, 4410, 4492, 5615, 5880, 6738, 7861, 8820, 8984, 10107, 11230, 13476, 15722, 16845, 17640, 20214, 22460, 23583, 26952, 31444, 33690, 39305, 40428, 44920, 47166, 50535, 55027, 62888, 67380, 70749, 78610, 80856, 94332, 101070, 110054, 117915, 134760, 141498, 157220, 165081, 188664, 202140, 220108, 235830, 275135, 282996, 314440, 330162, 353745, 404280, 440216, 471660, 495243, 550270, 565992, 660324, 707490, 825405, 943320, 990486, 1100540, 1320648, 1414980, 1650810, 1980972, 2201080, 2476215, 2829960, 3301620, 3961944, 4952430, 6603240, 9904860, 19809720]

約数ペア:

[(1, 19809720), (2, 9904860), (3, 6603240), (4, 4952430), (5, 3961944), (6, 3301620), (7, 2829960), (8, 2476215), (9, 2201080), (10, 1980972), (12, 1650810), (14, 1414980), (15, 1320648), (18, 1100540), (20, 990486), (21, 943320), (24, 825405), (28, 707490), (30, 660324), (35, 565992), (36, 550270), (40, 495243), (42, 471660), (45, 440216), (49, 404280), (56, 353745), (60, 330162), (63, 314440), (70, 282996), (72, 275135), (84, 235830), (90, 220108), (98, 202140), (105, 188664), (120, 165081), (126, 157220), (140, 141498), (147, 134760), (168, 117915), (180, 110054), (196, 101070), (210, 94332), (245, 80856), (252, 78610), (280, 70749), (294, 67380), (315, 62888), (360, 55027), (392, 50535), (420, 47166), (441, 44920), (490, 40428), (504, 39305), (588, 33690), (630, 31444), (735, 26952), (840, 23583), (882, 22460), (980, 20214), (1123, 17640), (1176, 16845), (1260, 15722), (1470, 13476), (1764, 11230), (1960, 10107), (2205, 8984), (2246, 8820), (2520, 7861), (2940, 6738), (3369, 5880), (3528, 5615), (4410, 4492)]