19995250

素因数分解:

$2^1\times 5^3\times {\mathrm{11}}^2\times {\mathrm{661}}^1$

素因数の和:700

約数の個数: 48

約数和(自身を含む): 41205528

約数和(自身を除く): 21210278

約数列:

[1, 2, 5, 10, 11, 22, 25, 50, 55, 110, 121, 125, 242, 250, 275, 550, 605, 661, 1210, 1322, 1375, 2750, 3025, 3305, 6050, 6610, 7271, 14542, 15125, 16525, 30250, 33050, 36355, 72710, 79981, 82625, 159962, 165250, 181775, 363550, 399905, 799810, 908875, 1817750, 1999525, 3999050, 9997625, 19995250]

約数ペア:

[(1, 19995250), (2, 9997625), (5, 3999050), (10, 1999525), (11, 1817750), (22, 908875), (25, 799810), (50, 399905), (55, 363550), (110, 181775), (121, 165250), (125, 159962), (242, 82625), (250, 79981), (275, 72710), (550, 36355), (605, 33050), (661, 30250), (1210, 16525), (1322, 15125), (1375, 14542), (2750, 7271), (3025, 6610), (3305, 6050)]