81250000

素因数分解:

$2^4\times 5^8\times {\mathrm{13}}^1$

素因数の和:61

約数の個数: 90

約数和(自身を含む): 211913954

約数和(自身を除く): 130663954

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 40, 50, 52, 65, 80, 100, 104, 125, 130, 200, 208, 250, 260, 325, 400, 500, 520, 625, 650, 1000, 1040, 1250, 1300, 1625, 2000, 2500, 2600, 3125, 3250, 5000, 5200, 6250, 6500, 8125, 10000, 12500, 13000, 15625, 16250, 25000, 26000, 31250, 32500, 40625, 50000, 62500, 65000, 78125, 81250, 125000, 130000, 156250, 162500, 203125, 250000, 312500, 325000, 390625, 406250, 625000, 650000, 781250, 812500, 1015625, 1250000, 1562500, 1625000, 2031250, 3125000, 3250000, 4062500, 5078125, 6250000, 8125000, 10156250, 16250000, 20312500, 40625000, 81250000]

約数ペア:

[(1, 81250000), (2, 40625000), (4, 20312500), (5, 16250000), (8, 10156250), (10, 8125000), (13, 6250000), (16, 5078125), (20, 4062500), (25, 3250000), (26, 3125000), (40, 2031250), (50, 1625000), (52, 1562500), (65, 1250000), (80, 1015625), (100, 812500), (104, 781250), (125, 650000), (130, 625000), (200, 406250), (208, 390625), (250, 325000), (260, 312500), (325, 250000), (400, 203125), (500, 162500), (520, 156250), (625, 130000), (650, 125000), (1000, 81250), (1040, 78125), (1250, 65000), (1300, 62500), (1625, 50000), (2000, 40625), (2500, 32500), (2600, 31250), (3125, 26000), (3250, 25000), (5000, 16250), (5200, 15625), (6250, 13000), (6500, 12500), (8125, 10000)]