21038875

素因数分解:

$5^3\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{107}}^1$

素因数の和:157

約数の個数: 48

約数和(自身を含む): 31370976

約数和(自身を除く): 10332101

約数列:

[1, 5, 11, 13, 25, 55, 65, 107, 121, 125, 143, 275, 325, 535, 605, 715, 1177, 1375, 1391, 1573, 1625, 2675, 3025, 3575, 5885, 6955, 7865, 12947, 13375, 15125, 15301, 17875, 29425, 34775, 39325, 64735, 76505, 147125, 168311, 173875, 196625, 323675, 382525, 841555, 1618375, 1912625, 4207775, 21038875]

約数ペア:

[(1, 21038875), (5, 4207775), (11, 1912625), (13, 1618375), (25, 841555), (55, 382525), (65, 323675), (107, 196625), (121, 173875), (125, 168311), (143, 147125), (275, 76505), (325, 64735), (535, 39325), (605, 34775), (715, 29425), (1177, 17875), (1375, 15301), (1391, 15125), (1573, 13375), (1625, 12947), (2675, 7865), (3025, 6955), (3575, 5885)]