21013280

素因数分解:

$2^5\times 5^1\times {\mathrm{61}}^1\times {\mathrm{2153}}^1$

素因数の和:2229

約数の個数: 48

約数和(自身を含む): 50481144

約数和(自身を除く): 29467864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 80, 122, 160, 244, 305, 488, 610, 976, 1220, 1952, 2153, 2440, 4306, 4880, 8612, 9760, 10765, 17224, 21530, 34448, 43060, 68896, 86120, 131333, 172240, 262666, 344480, 525332, 656665, 1050664, 1313330, 2101328, 2626660, 4202656, 5253320, 10506640, 21013280]

約数ペア:

[(1, 21013280), (2, 10506640), (4, 5253320), (5, 4202656), (8, 2626660), (10, 2101328), (16, 1313330), (20, 1050664), (32, 656665), (40, 525332), (61, 344480), (80, 262666), (122, 172240), (160, 131333), (244, 86120), (305, 68896), (488, 43060), (610, 34448), (976, 21530), (1220, 17224), (1952, 10765), (2153, 9760), (2440, 8612), (4306, 4880)]