21313880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{467}}^1$

素因数の和:648

約数の個数: 64

約数和(自身を含む): 55261440

約数和(自身を除く): 33947560

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 163, 280, 326, 467, 652, 815, 934, 1141, 1304, 1630, 1868, 2282, 2335, 3260, 3269, 3736, 4564, 4670, 5705, 6520, 6538, 9128, 9340, 11410, 13076, 16345, 18680, 22820, 26152, 32690, 45640, 65380, 76121, 130760, 152242, 304484, 380605, 532847, 608968, 761210, 1065694, 1522420, 2131388, 2664235, 3044840, 4262776, 5328470, 10656940, 21313880]

約数ペア:

[(1, 21313880), (2, 10656940), (4, 5328470), (5, 4262776), (7, 3044840), (8, 2664235), (10, 2131388), (14, 1522420), (20, 1065694), (28, 761210), (35, 608968), (40, 532847), (56, 380605), (70, 304484), (140, 152242), (163, 130760), (280, 76121), (326, 65380), (467, 45640), (652, 32690), (815, 26152), (934, 22820), (1141, 18680), (1304, 16345), (1630, 13076), (1868, 11410), (2282, 9340), (2335, 9128), (3260, 6538), (3269, 6520), (3736, 5705), (4564, 4670)]