21457990

素因数分解:

$2^1\times 5^1\times {\mathrm{83}}^1\times {\mathrm{103}}^1\times {\mathrm{251}}^1$

素因数の和:444

約数の個数: 32

約数和(自身を含む): 39626496

約数和(自身を除く): 18168506

約数列:

[1, 2, 5, 10, 83, 103, 166, 206, 251, 415, 502, 515, 830, 1030, 1255, 2510, 8549, 17098, 20833, 25853, 41666, 42745, 51706, 85490, 104165, 129265, 208330, 258530, 2145799, 4291598, 10728995, 21457990]

約数ペア:

[(1, 21457990), (2, 10728995), (5, 4291598), (10, 2145799), (83, 258530), (103, 208330), (166, 129265), (206, 104165), (251, 85490), (415, 51706), (502, 42745), (515, 41666), (830, 25853), (1030, 20833), (1255, 17098), (2510, 8549)]