21688784

素因数分解:

$2^4\times {\mathrm{13}}^3\times {\mathrm{617}}^1$

素因数の和:664

約数の個数: 40

約数和(自身を含む): 45596040

約数和(自身を除く): 23907256

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 169, 208, 338, 617, 676, 1234, 1352, 2197, 2468, 2704, 4394, 4936, 8021, 8788, 9872, 16042, 17576, 32084, 35152, 64168, 104273, 128336, 208546, 417092, 834184, 1355549, 1668368, 2711098, 5422196, 10844392, 21688784]

約数ペア:

[(1, 21688784), (2, 10844392), (4, 5422196), (8, 2711098), (13, 1668368), (16, 1355549), (26, 834184), (52, 417092), (104, 208546), (169, 128336), (208, 104273), (338, 64168), (617, 35152), (676, 32084), (1234, 17576), (1352, 16042), (2197, 9872), (2468, 8788), (2704, 8021), (4394, 4936)]