21211065

素因数分解:

$3^4\times 5^1\times {\mathrm{83}}^1\times {\mathrm{631}}^1$

素因数の和:731

約数の個数: 40

約数和(自身を含む): 38541888

約数和(自身を除く): 17330823

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 83, 135, 249, 405, 415, 631, 747, 1245, 1893, 2241, 3155, 3735, 5679, 6723, 9465, 11205, 17037, 28395, 33615, 51111, 52373, 85185, 157119, 255555, 261865, 471357, 785595, 1414071, 2356785, 4242213, 7070355, 21211065]

約数ペア:

[(1, 21211065), (3, 7070355), (5, 4242213), (9, 2356785), (15, 1414071), (27, 785595), (45, 471357), (81, 261865), (83, 255555), (135, 157119), (249, 85185), (405, 52373), (415, 51111), (631, 33615), (747, 28395), (1245, 17037), (1893, 11205), (2241, 9465), (3155, 6723), (3735, 5679)]