21178980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{1213}}^1$

素因数の和:1325

約数の個数: 72

約数和(自身を含む): 64958712

約数和(自身を除く): 43779732

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 97, 180, 194, 291, 388, 485, 582, 873, 970, 1164, 1213, 1455, 1746, 1940, 2426, 2910, 3492, 3639, 4365, 4852, 5820, 6065, 7278, 8730, 10917, 12130, 14556, 17460, 18195, 21834, 24260, 36390, 43668, 54585, 72780, 109170, 117661, 218340, 235322, 352983, 470644, 588305, 705966, 1058949, 1176610, 1411932, 1764915, 2117898, 2353220, 3529830, 4235796, 5294745, 7059660, 10589490, 21178980]

約数ペア:

[(1, 21178980), (2, 10589490), (3, 7059660), (4, 5294745), (5, 4235796), (6, 3529830), (9, 2353220), (10, 2117898), (12, 1764915), (15, 1411932), (18, 1176610), (20, 1058949), (30, 705966), (36, 588305), (45, 470644), (60, 352983), (90, 235322), (97, 218340), (180, 117661), (194, 109170), (291, 72780), (388, 54585), (485, 43668), (582, 36390), (873, 24260), (970, 21834), (1164, 18195), (1213, 17460), (1455, 14556), (1746, 12130), (1940, 10917), (2426, 8730), (2910, 7278), (3492, 6065), (3639, 5820), (4365, 4852)]