30720820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{149}}^1$

素因数の和:245

約数の個数: 72

約数和(自身を含む): 71479800

約数和(自身を除く): 40758980

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 149, 169, 244, 260, 298, 305, 338, 596, 610, 676, 745, 793, 845, 1220, 1490, 1586, 1690, 1937, 2980, 3172, 3380, 3874, 3965, 7748, 7930, 9089, 9685, 10309, 15860, 18178, 19370, 20618, 25181, 36356, 38740, 41236, 45445, 50362, 51545, 90890, 100724, 103090, 118157, 125905, 181780, 206180, 236314, 251810, 472628, 503620, 590785, 1181570, 1536041, 2363140, 3072082, 6144164, 7680205, 15360410, 30720820]

約数ペア:

[(1, 30720820), (2, 15360410), (4, 7680205), (5, 6144164), (10, 3072082), (13, 2363140), (20, 1536041), (26, 1181570), (52, 590785), (61, 503620), (65, 472628), (122, 251810), (130, 236314), (149, 206180), (169, 181780), (244, 125905), (260, 118157), (298, 103090), (305, 100724), (338, 90890), (596, 51545), (610, 50362), (676, 45445), (745, 41236), (793, 38740), (845, 36356), (1220, 25181), (1490, 20618), (1586, 19370), (1690, 18178), (1937, 15860), (2980, 10309), (3172, 9685), (3380, 9089), (3874, 7930), (3965, 7748)]