20121247760

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{103}}^1\times {\mathrm{128521}}^1$

素因数の和:128656

約数の個数: 80

約数和(自身を含む): 49722591360

約数和(自身を除く): 29601343600

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 103, 152, 190, 206, 304, 380, 412, 515, 760, 824, 1030, 1520, 1648, 1957, 2060, 3914, 4120, 7828, 8240, 9785, 15656, 19570, 31312, 39140, 78280, 128521, 156560, 257042, 514084, 642605, 1028168, 1285210, 2056336, 2441899, 2570420, 4883798, 5140840, 9767596, 10281680, 12209495, 13237663, 19535192, 24418990, 26475326, 39070384, 48837980, 52950652, 66188315, 97675960, 105901304, 132376630, 195351920, 211802608, 251515597, 264753260, 503031194, 529506520, 1006062388, 1059013040, 1257577985, 2012124776, 2515155970, 4024249552, 5030311940, 10060623880, 20121247760]

約数ペア:

[(1, 20121247760), (2, 10060623880), (4, 5030311940), (5, 4024249552), (8, 2515155970), (10, 2012124776), (16, 1257577985), (19, 1059013040), (20, 1006062388), (38, 529506520), (40, 503031194), (76, 264753260), (80, 251515597), (95, 211802608), (103, 195351920), (152, 132376630), (190, 105901304), (206, 97675960), (304, 66188315), (380, 52950652), (412, 48837980), (515, 39070384), (760, 26475326), (824, 24418990), (1030, 19535192), (1520, 13237663), (1648, 12209495), (1957, 10281680), (2060, 9767596), (3914, 5140840), (4120, 4883798), (7828, 2570420), (8240, 2441899), (9785, 2056336), (15656, 1285210), (19570, 1028168), (31312, 642605), (39140, 514084), (78280, 257042), (128521, 156560)]