21390978

素因数分解:

$2^1\times 3^1\times 7^1\times {\mathrm{239}}^1\times {\mathrm{2131}}^1$

素因数の和:2382

約数の個数: 32

約数和(自身を含む): 49121280

約数和(自身を除く): 27730302

約数列:

[1, 2, 3, 6, 7, 14, 21, 42, 239, 478, 717, 1434, 1673, 2131, 3346, 4262, 5019, 6393, 10038, 12786, 14917, 29834, 44751, 89502, 509309, 1018618, 1527927, 3055854, 3565163, 7130326, 10695489, 21390978]

約数ペア:

[(1, 21390978), (2, 10695489), (3, 7130326), (6, 3565163), (7, 3055854), (14, 1527927), (21, 1018618), (42, 509309), (239, 89502), (478, 44751), (717, 29834), (1434, 14917), (1673, 12786), (2131, 10038), (3346, 6393), (4262, 5019)]