21003398

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:153

約数の個数: 64

約数和(自身を含む): 39372480

約数和(自身を除く): 18369082

約数列:

[1, 2, 13, 17, 19, 26, 34, 38, 41, 61, 82, 122, 221, 247, 323, 442, 494, 533, 646, 697, 779, 793, 1037, 1066, 1159, 1394, 1558, 1586, 2074, 2318, 2501, 4199, 5002, 8398, 9061, 10127, 13243, 13481, 15067, 18122, 19703, 20254, 26486, 26962, 30134, 32513, 39406, 42517, 47519, 65026, 85034, 95038, 172159, 256139, 344318, 512278, 552721, 617747, 807823, 1105442, 1235494, 1615646, 10501699, 21003398]

約数ペア:

[(1, 21003398), (2, 10501699), (13, 1615646), (17, 1235494), (19, 1105442), (26, 807823), (34, 617747), (38, 552721), (41, 512278), (61, 344318), (82, 256139), (122, 172159), (221, 95038), (247, 85034), (323, 65026), (442, 47519), (494, 42517), (533, 39406), (646, 32513), (697, 30134), (779, 26962), (793, 26486), (1037, 20254), (1066, 19703), (1159, 18122), (1394, 15067), (1558, 13481), (1586, 13243), (2074, 10127), (2318, 9061), (2501, 8398), (4199, 5002)]