21390760

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{83}}^1\times {\mathrm{379}}^1$

素因数の和:490

約数の個数: 64

約数和(自身を含む): 51710400

約数和(自身を除く): 30319640

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 83, 85, 136, 166, 170, 332, 340, 379, 415, 664, 680, 758, 830, 1411, 1516, 1660, 1895, 2822, 3032, 3320, 3790, 5644, 6443, 7055, 7580, 11288, 12886, 14110, 15160, 25772, 28220, 31457, 32215, 51544, 56440, 62914, 64430, 125828, 128860, 157285, 251656, 257720, 314570, 534769, 629140, 1069538, 1258280, 2139076, 2673845, 4278152, 5347690, 10695380, 21390760]

約数ペア:

[(1, 21390760), (2, 10695380), (4, 5347690), (5, 4278152), (8, 2673845), (10, 2139076), (17, 1258280), (20, 1069538), (34, 629140), (40, 534769), (68, 314570), (83, 257720), (85, 251656), (136, 157285), (166, 128860), (170, 125828), (332, 64430), (340, 62914), (379, 56440), (415, 51544), (664, 32215), (680, 31457), (758, 28220), (830, 25772), (1411, 15160), (1516, 14110), (1660, 12886), (1895, 11288), (2822, 7580), (3032, 7055), (3320, 6443), (3790, 5644)]