20921428

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1$

素因数の和:304

約数の個数: 48

約数和(自身を含む): 41827968

約数和(自身を除く): 20906540

約数列:

[1, 2, 4, 11, 22, 37, 44, 71, 74, 142, 148, 181, 284, 362, 407, 724, 781, 814, 1562, 1628, 1991, 2627, 3124, 3982, 5254, 6697, 7964, 10508, 12851, 13394, 25702, 26788, 28897, 51404, 57794, 73667, 115588, 141361, 147334, 282722, 294668, 475487, 565444, 950974, 1901948, 5230357, 10460714, 20921428]

約数ペア:

[(1, 20921428), (2, 10460714), (4, 5230357), (11, 1901948), (22, 950974), (37, 565444), (44, 475487), (71, 294668), (74, 282722), (142, 147334), (148, 141361), (181, 115588), (284, 73667), (362, 57794), (407, 51404), (724, 28897), (781, 26788), (814, 25702), (1562, 13394), (1628, 12851), (1991, 10508), (2627, 7964), (3124, 6697), (3982, 5254)]