21820491

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^2$

素因数の和:121

約数の個数: 72

約数和(自身を含む): 42142464

約数和(自身を除く): 20321973

約数列:

[1, 3, 7, 9, 11, 21, 23, 33, 37, 63, 69, 77, 99, 111, 161, 207, 231, 253, 259, 333, 407, 483, 693, 759, 777, 851, 1221, 1369, 1449, 1771, 2277, 2331, 2553, 2849, 3663, 4107, 5313, 5957, 7659, 8547, 9361, 9583, 12321, 15059, 15939, 17871, 25641, 28083, 28749, 31487, 45177, 53613, 65527, 84249, 86247, 94461, 105413, 135531, 196581, 220409, 283383, 316239, 346357, 589743, 661227, 948717, 1039071, 1983681, 2424499, 3117213, 7273497, 21820491]

約数ペア:

[(1, 21820491), (3, 7273497), (7, 3117213), (9, 2424499), (11, 1983681), (21, 1039071), (23, 948717), (33, 661227), (37, 589743), (63, 346357), (69, 316239), (77, 283383), (99, 220409), (111, 196581), (161, 135531), (207, 105413), (231, 94461), (253, 86247), (259, 84249), (333, 65527), (407, 53613), (483, 45177), (693, 31487), (759, 28749), (777, 28083), (851, 25641), (1221, 17871), (1369, 15939), (1449, 15059), (1771, 12321), (2277, 9583), (2331, 9361), (2553, 8547), (2849, 7659), (3663, 5957), (4107, 5313)]