20969980

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1\times {\mathrm{271}}^1$

素因数の和:406

約数の個数: 48

約数和(自身を含む): 45650304

約数和(自身を除く): 24680324

約数列:

[1, 2, 4, 5, 10, 20, 53, 73, 106, 146, 212, 265, 271, 292, 365, 530, 542, 730, 1060, 1084, 1355, 1460, 2710, 3869, 5420, 7738, 14363, 15476, 19345, 19783, 28726, 38690, 39566, 57452, 71815, 77380, 79132, 98915, 143630, 197830, 287260, 395660, 1048499, 2096998, 4193996, 5242495, 10484990, 20969980]

約数ペア:

[(1, 20969980), (2, 10484990), (4, 5242495), (5, 4193996), (10, 2096998), (20, 1048499), (53, 395660), (73, 287260), (106, 197830), (146, 143630), (212, 98915), (265, 79132), (271, 77380), (292, 71815), (365, 57452), (530, 39566), (542, 38690), (730, 28726), (1060, 19783), (1084, 19345), (1355, 15476), (1460, 14363), (2710, 7738), (3869, 5420)]