20947888

素因数分解:

$2^4\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{127}}^1$

素因数の和:222

約数の個数: 60

約数和(自身を含む): 45020928

約数和(自身を除く): 24073040

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 61, 104, 122, 127, 169, 208, 244, 254, 338, 488, 508, 676, 793, 976, 1016, 1352, 1586, 1651, 2032, 2704, 3172, 3302, 6344, 6604, 7747, 10309, 12688, 13208, 15494, 20618, 21463, 26416, 30988, 41236, 42926, 61976, 82472, 85852, 100711, 123952, 164944, 171704, 201422, 343408, 402844, 805688, 1309243, 1611376, 2618486, 5236972, 10473944, 20947888]

約数ペア:

[(1, 20947888), (2, 10473944), (4, 5236972), (8, 2618486), (13, 1611376), (16, 1309243), (26, 805688), (52, 402844), (61, 343408), (104, 201422), (122, 171704), (127, 164944), (169, 123952), (208, 100711), (244, 85852), (254, 82472), (338, 61976), (488, 42926), (508, 41236), (676, 30988), (793, 26416), (976, 21463), (1016, 20618), (1352, 15494), (1586, 13208), (1651, 12688), (2032, 10309), (2704, 7747), (3172, 6604), (3302, 6344)]