21213902

素因数分解:

$2^1\times {\mathrm{137}}^1\times {\mathrm{139}}^1\times {\mathrm{557}}^1$

素因数の和:835

約数の個数: 16

約数和(自身を含む): 32341680

約数和(自身を除く): 11127778

約数列:

[1, 2, 137, 139, 274, 278, 557, 1114, 19043, 38086, 76309, 77423, 152618, 154846, 10606951, 21213902]

約数ペア:

[(1, 21213902), (2, 10606951), (137, 154846), (139, 152618), (274, 77423), (278, 76309), (557, 38086), (1114, 19043)]