21220375

素因数分解:

$5^3\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{61}}^1$

素因数の和:121

約数の個数: 48

約数和(自身を含む): 30873024

約数和(自身を除く): 9652649

約数列:

[1, 5, 11, 23, 25, 55, 61, 115, 121, 125, 253, 275, 305, 575, 605, 671, 1265, 1375, 1403, 1525, 2783, 2875, 3025, 3355, 6325, 7015, 7381, 7625, 13915, 15125, 15433, 16775, 31625, 35075, 36905, 69575, 77165, 83875, 169763, 175375, 184525, 347875, 385825, 848815, 922625, 1929125, 4244075, 21220375]

約数ペア:

[(1, 21220375), (5, 4244075), (11, 1929125), (23, 922625), (25, 848815), (55, 385825), (61, 347875), (115, 184525), (121, 175375), (125, 169763), (253, 83875), (275, 77165), (305, 69575), (575, 36905), (605, 35075), (671, 31625), (1265, 16775), (1375, 15433), (1403, 15125), (1525, 13915), (2783, 7625), (2875, 7381), (3025, 7015), (3355, 6325)]