81278900

素因数分解:

$2^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{157}}^1\times {\mathrm{167}}^1$

素因数の和:369

約数の個数: 72

約数和(自身を含む): 184321536

約数和(自身を除く): 103042636

約数列:

[1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 100, 124, 155, 157, 167, 310, 314, 334, 620, 628, 668, 775, 785, 835, 1550, 1570, 1670, 3100, 3140, 3340, 3925, 4175, 4867, 5177, 7850, 8350, 9734, 10354, 15700, 16700, 19468, 20708, 24335, 25885, 26219, 48670, 51770, 52438, 97340, 103540, 104876, 121675, 129425, 131095, 243350, 258850, 262190, 486700, 517700, 524380, 655475, 812789, 1310950, 1625578, 2621900, 3251156, 4063945, 8127890, 16255780, 20319725, 40639450, 81278900]

約数ペア:

[(1, 81278900), (2, 40639450), (4, 20319725), (5, 16255780), (10, 8127890), (20, 4063945), (25, 3251156), (31, 2621900), (50, 1625578), (62, 1310950), (100, 812789), (124, 655475), (155, 524380), (157, 517700), (167, 486700), (310, 262190), (314, 258850), (334, 243350), (620, 131095), (628, 129425), (668, 121675), (775, 104876), (785, 103540), (835, 97340), (1550, 52438), (1570, 51770), (1670, 48670), (3100, 26219), (3140, 25885), (3340, 24335), (3925, 20708), (4175, 19468), (4867, 16700), (5177, 15700), (7850, 10354), (8350, 9734)]