81165440

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{4091}}^1$

素因数の和:4141

約数の個数: 64

約数和(自身を含む): 200344320

約数和(自身を除く): 119178880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1240, 1984, 2480, 3968, 4091, 4960, 8182, 9920, 16364, 19840, 20455, 32728, 40910, 65456, 81820, 126821, 130912, 163640, 253642, 261824, 327280, 507284, 523648, 634105, 654560, 1014568, 1268210, 1309120, 2029136, 2536420, 2618240, 4058272, 5072840, 8116544, 10145680, 16233088, 20291360, 40582720, 81165440]

約数ペア:

[(1, 81165440), (2, 40582720), (4, 20291360), (5, 16233088), (8, 10145680), (10, 8116544), (16, 5072840), (20, 4058272), (31, 2618240), (32, 2536420), (40, 2029136), (62, 1309120), (64, 1268210), (80, 1014568), (124, 654560), (128, 634105), (155, 523648), (160, 507284), (248, 327280), (310, 261824), (320, 253642), (496, 163640), (620, 130912), (640, 126821), (992, 81820), (1240, 65456), (1984, 40910), (2480, 32728), (3968, 20455), (4091, 19840), (4960, 16364), (8182, 9920)]