12640420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{797}}^1$

素因数の和:880

約数の個数: 48

約数和(自身を含む): 29091888

約数和(自身を除く): 16451468

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 244, 260, 305, 610, 793, 797, 1220, 1586, 1594, 3172, 3188, 3965, 3985, 7930, 7970, 10361, 15860, 15940, 20722, 41444, 48617, 51805, 97234, 103610, 194468, 207220, 243085, 486170, 632021, 972340, 1264042, 2528084, 3160105, 6320210, 12640420]

約数ペア:

[(1, 12640420), (2, 6320210), (4, 3160105), (5, 2528084), (10, 1264042), (13, 972340), (20, 632021), (26, 486170), (52, 243085), (61, 207220), (65, 194468), (122, 103610), (130, 97234), (244, 51805), (260, 48617), (305, 41444), (610, 20722), (793, 15940), (797, 15860), (1220, 10361), (1586, 7970), (1594, 7930), (3172, 3985), (3188, 3965)]