20999910

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{223}}^1$

素因数の和:349

約数の個数: 64

約数和(自身を含む): 52512768

約数和(自身を除く): 31512858

約数列:

[1, 2, 3, 5, 6, 10, 15, 30, 43, 73, 86, 129, 146, 215, 219, 223, 258, 365, 430, 438, 446, 645, 669, 730, 1095, 1115, 1290, 1338, 2190, 2230, 3139, 3345, 6278, 6690, 9417, 9589, 15695, 16279, 18834, 19178, 28767, 31390, 32558, 47085, 47945, 48837, 57534, 81395, 94170, 95890, 97674, 143835, 162790, 244185, 287670, 488370, 699997, 1399994, 2099991, 3499985, 4199982, 6999970, 10499955, 20999910]

約数ペア:

[(1, 20999910), (2, 10499955), (3, 6999970), (5, 4199982), (6, 3499985), (10, 2099991), (15, 1399994), (30, 699997), (43, 488370), (73, 287670), (86, 244185), (129, 162790), (146, 143835), (215, 97674), (219, 95890), (223, 94170), (258, 81395), (365, 57534), (430, 48837), (438, 47945), (446, 47085), (645, 32558), (669, 31390), (730, 28767), (1095, 19178), (1115, 18834), (1290, 16279), (1338, 15695), (2190, 9589), (2230, 9417), (3139, 6690), (3345, 6278)]