21085520

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{4973}}^1$

素因数の和:5039

約数の個数: 40

約数和(自身を含む): 49958856

約数和(自身を除く): 28873336

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 80, 106, 212, 265, 424, 530, 848, 1060, 2120, 4240, 4973, 9946, 19892, 24865, 39784, 49730, 79568, 99460, 198920, 263569, 397840, 527138, 1054276, 1317845, 2108552, 2635690, 4217104, 5271380, 10542760, 21085520]

約数ペア:

[(1, 21085520), (2, 10542760), (4, 5271380), (5, 4217104), (8, 2635690), (10, 2108552), (16, 1317845), (20, 1054276), (40, 527138), (53, 397840), (80, 263569), (106, 198920), (212, 99460), (265, 79568), (424, 49730), (530, 39784), (848, 24865), (1060, 19892), (2120, 9946), (4240, 4973)]