21307760

素因数分解:

$2^4\times 5^1\times {\mathrm{83}}^1\times {\mathrm{3209}}^1$

素因数の和:3305

約数の個数: 40

約数和(自身を含む): 50153040

約数和(自身を除く): 28845280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 83, 166, 332, 415, 664, 830, 1328, 1660, 3209, 3320, 6418, 6640, 12836, 16045, 25672, 32090, 51344, 64180, 128360, 256720, 266347, 532694, 1065388, 1331735, 2130776, 2663470, 4261552, 5326940, 10653880, 21307760]

約数ペア:

[(1, 21307760), (2, 10653880), (4, 5326940), (5, 4261552), (8, 2663470), (10, 2130776), (16, 1331735), (20, 1065388), (40, 532694), (80, 266347), (83, 256720), (166, 128360), (332, 64180), (415, 51344), (664, 32090), (830, 25672), (1328, 16045), (1660, 12836), (3209, 6640), (3320, 6418)]