21717780

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{83}}^1\times {\mathrm{89}}^1$

素因数の和:198

約数の個数: 144

約数和(自身を含む): 72394560

約数和(自身を除く): 50676780

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 83, 84, 89, 98, 105, 140, 147, 166, 178, 196, 210, 245, 249, 267, 294, 332, 356, 415, 420, 445, 490, 498, 534, 581, 588, 623, 735, 830, 890, 980, 996, 1068, 1162, 1245, 1246, 1335, 1470, 1660, 1743, 1780, 1869, 2324, 2490, 2492, 2670, 2905, 2940, 3115, 3486, 3738, 4067, 4361, 4980, 5340, 5810, 6230, 6972, 7387, 7476, 8134, 8715, 8722, 9345, 11620, 12201, 12460, 13083, 14774, 16268, 17430, 17444, 18690, 20335, 21805, 22161, 24402, 26166, 29548, 34860, 36935, 37380, 40670, 43610, 44322, 48804, 51709, 52332, 61005, 65415, 73870, 81340, 87220, 88644, 103418, 110805, 122010, 130830, 147740, 155127, 206836, 221610, 244020, 258545, 261660, 310254, 361963, 443220, 517090, 620508, 723926, 775635, 1034180, 1085889, 1447852, 1551270, 1809815, 2171778, 3102540, 3619630, 4343556, 5429445, 7239260, 10858890, 21717780]

約数ペア:

[(1, 21717780), (2, 10858890), (3, 7239260), (4, 5429445), (5, 4343556), (6, 3619630), (7, 3102540), (10, 2171778), (12, 1809815), (14, 1551270), (15, 1447852), (20, 1085889), (21, 1034180), (28, 775635), (30, 723926), (35, 620508), (42, 517090), (49, 443220), (60, 361963), (70, 310254), (83, 261660), (84, 258545), (89, 244020), (98, 221610), (105, 206836), (140, 155127), (147, 147740), (166, 130830), (178, 122010), (196, 110805), (210, 103418), (245, 88644), (249, 87220), (267, 81340), (294, 73870), (332, 65415), (356, 61005), (415, 52332), (420, 51709), (445, 48804), (490, 44322), (498, 43610), (534, 40670), (581, 37380), (588, 36935), (623, 34860), (735, 29548), (830, 26166), (890, 24402), (980, 22161), (996, 21805), (1068, 20335), (1162, 18690), (1245, 17444), (1246, 17430), (1335, 16268), (1470, 14774), (1660, 13083), (1743, 12460), (1780, 12201), (1869, 11620), (2324, 9345), (2490, 8722), (2492, 8715), (2670, 8134), (2905, 7476), (2940, 7387), (3115, 6972), (3486, 6230), (3738, 5810), (4067, 5340), (4361, 4980)]