81249920

素因数分解:

$2^7\times 5^1\times {\mathrm{79}}^1\times {\mathrm{1607}}^1$

素因数の和:1705

約数の個数: 64

約数和(自身を含む): 196819200

約数和(自身を除く): 115569280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 128, 158, 160, 316, 320, 395, 632, 640, 790, 1264, 1580, 1607, 2528, 3160, 3214, 5056, 6320, 6428, 8035, 10112, 12640, 12856, 16070, 25280, 25712, 32140, 50560, 51424, 64280, 102848, 126953, 128560, 205696, 253906, 257120, 507812, 514240, 634765, 1015624, 1028480, 1269530, 2031248, 2539060, 4062496, 5078120, 8124992, 10156240, 16249984, 20312480, 40624960, 81249920]

約数ペア:

[(1, 81249920), (2, 40624960), (4, 20312480), (5, 16249984), (8, 10156240), (10, 8124992), (16, 5078120), (20, 4062496), (32, 2539060), (40, 2031248), (64, 1269530), (79, 1028480), (80, 1015624), (128, 634765), (158, 514240), (160, 507812), (316, 257120), (320, 253906), (395, 205696), (632, 128560), (640, 126953), (790, 102848), (1264, 64280), (1580, 51424), (1607, 50560), (2528, 32140), (3160, 25712), (3214, 25280), (5056, 16070), (6320, 12856), (6428, 12640), (8035, 10112)]