21102340

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{353}}^1$

素因数の和:437

約数の個数: 72

約数和(自身を含む): 52543512

約数和(自身を除く): 31441172

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 61, 70, 98, 122, 140, 196, 244, 245, 305, 353, 427, 490, 610, 706, 854, 980, 1220, 1412, 1708, 1765, 2135, 2471, 2989, 3530, 4270, 4942, 5978, 7060, 8540, 9884, 11956, 12355, 14945, 17297, 21533, 24710, 29890, 34594, 43066, 49420, 59780, 69188, 86132, 86485, 107665, 150731, 172970, 215330, 301462, 345940, 430660, 602924, 753655, 1055117, 1507310, 2110234, 3014620, 4220468, 5275585, 10551170, 21102340]

約数ペア:

[(1, 21102340), (2, 10551170), (4, 5275585), (5, 4220468), (7, 3014620), (10, 2110234), (14, 1507310), (20, 1055117), (28, 753655), (35, 602924), (49, 430660), (61, 345940), (70, 301462), (98, 215330), (122, 172970), (140, 150731), (196, 107665), (244, 86485), (245, 86132), (305, 69188), (353, 59780), (427, 49420), (490, 43066), (610, 34594), (706, 29890), (854, 24710), (980, 21533), (1220, 17297), (1412, 14945), (1708, 12355), (1765, 11956), (2135, 9884), (2471, 8540), (2989, 7060), (3530, 5978), (4270, 4942)]