21407960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{757}}^1$

素因数の和:876

約数の個数: 64

約数和(自身を含む): 55667520

約数和(自身を除く): 34259560

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 101, 140, 202, 280, 404, 505, 707, 757, 808, 1010, 1414, 1514, 2020, 2828, 3028, 3535, 3785, 4040, 5299, 5656, 6056, 7070, 7570, 10598, 14140, 15140, 21196, 26495, 28280, 30280, 42392, 52990, 76457, 105980, 152914, 211960, 305828, 382285, 535199, 611656, 764570, 1070398, 1529140, 2140796, 2675995, 3058280, 4281592, 5351990, 10703980, 21407960]

約数ペア:

[(1, 21407960), (2, 10703980), (4, 5351990), (5, 4281592), (7, 3058280), (8, 2675995), (10, 2140796), (14, 1529140), (20, 1070398), (28, 764570), (35, 611656), (40, 535199), (56, 382285), (70, 305828), (101, 211960), (140, 152914), (202, 105980), (280, 76457), (404, 52990), (505, 42392), (707, 30280), (757, 28280), (808, 26495), (1010, 21196), (1414, 15140), (1514, 14140), (2020, 10598), (2828, 7570), (3028, 7070), (3535, 6056), (3785, 5656), (4040, 5299)]