19998800

素因数分解:

$2^4\times 5^2\times {\mathrm{17}}^2\times {\mathrm{173}}^1$

素因数の和:225

約数の個数: 90

約数和(自身を含む): 51334698

約数和(自身を除く): 31335898

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 25, 34, 40, 50, 68, 80, 85, 100, 136, 170, 173, 200, 272, 289, 340, 346, 400, 425, 578, 680, 692, 850, 865, 1156, 1360, 1384, 1445, 1700, 1730, 2312, 2768, 2890, 2941, 3400, 3460, 4325, 4624, 5780, 5882, 6800, 6920, 7225, 8650, 11560, 11764, 13840, 14450, 14705, 17300, 23120, 23528, 28900, 29410, 34600, 47056, 49997, 57800, 58820, 69200, 73525, 99994, 115600, 117640, 147050, 199988, 235280, 249985, 294100, 399976, 499970, 588200, 799952, 999940, 1176400, 1249925, 1999880, 2499850, 3999760, 4999700, 9999400, 19998800]

約数ペア:

[(1, 19998800), (2, 9999400), (4, 4999700), (5, 3999760), (8, 2499850), (10, 1999880), (16, 1249925), (17, 1176400), (20, 999940), (25, 799952), (34, 588200), (40, 499970), (50, 399976), (68, 294100), (80, 249985), (85, 235280), (100, 199988), (136, 147050), (170, 117640), (173, 115600), (200, 99994), (272, 73525), (289, 69200), (340, 58820), (346, 57800), (400, 49997), (425, 47056), (578, 34600), (680, 29410), (692, 28900), (850, 23528), (865, 23120), (1156, 17300), (1360, 14705), (1384, 14450), (1445, 13840), (1700, 11764), (1730, 11560), (2312, 8650), (2768, 7225), (2890, 6920), (2941, 6800), (3400, 5882), (3460, 5780), (4325, 4624)]