21311440

素因数分解:

$2^4\times 5^1\times {\mathrm{271}}^1\times {\mathrm{983}}^1$

素因数の和:1267

約数の個数: 40

約数和(自身を含む): 49782528

約数和(自身を除く): 28471088

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 271, 542, 983, 1084, 1355, 1966, 2168, 2710, 3932, 4336, 4915, 5420, 7864, 9830, 10840, 15728, 19660, 21680, 39320, 78640, 266393, 532786, 1065572, 1331965, 2131144, 2663930, 4262288, 5327860, 10655720, 21311440]

約数ペア:

[(1, 21311440), (2, 10655720), (4, 5327860), (5, 4262288), (8, 2663930), (10, 2131144), (16, 1331965), (20, 1065572), (40, 532786), (80, 266393), (271, 78640), (542, 39320), (983, 21680), (1084, 19660), (1355, 15728), (1966, 10840), (2168, 9830), (2710, 7864), (3932, 5420), (4336, 4915)]