20897080

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{389}}^1$

素因数の和:496

約数の個数: 64

約数和(自身を含む): 50544000

約数和(自身を除く): 29646920

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 79, 85, 136, 158, 170, 316, 340, 389, 395, 632, 680, 778, 790, 1343, 1556, 1580, 1945, 2686, 3112, 3160, 3890, 5372, 6613, 6715, 7780, 10744, 13226, 13430, 15560, 26452, 26860, 30731, 33065, 52904, 53720, 61462, 66130, 122924, 132260, 153655, 245848, 264520, 307310, 522427, 614620, 1044854, 1229240, 2089708, 2612135, 4179416, 5224270, 10448540, 20897080]

約数ペア:

[(1, 20897080), (2, 10448540), (4, 5224270), (5, 4179416), (8, 2612135), (10, 2089708), (17, 1229240), (20, 1044854), (34, 614620), (40, 522427), (68, 307310), (79, 264520), (85, 245848), (136, 153655), (158, 132260), (170, 122924), (316, 66130), (340, 61462), (389, 53720), (395, 52904), (632, 33065), (680, 30731), (778, 26860), (790, 26452), (1343, 15560), (1556, 13430), (1580, 13226), (1945, 10744), (2686, 7780), (3112, 6715), (3160, 6613), (3890, 5372)]