20921440

素因数分解:

$2^5\times 5^1\times {\mathrm{229}}^1\times {\mathrm{571}}^1$

素因数の和:815

約数の個数: 48

約数和(自身を含む): 49729680

約数和(自身を除く): 28808240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 229, 458, 571, 916, 1142, 1145, 1832, 2284, 2290, 2855, 3664, 4568, 4580, 5710, 7328, 9136, 9160, 11420, 18272, 18320, 22840, 36640, 45680, 91360, 130759, 261518, 523036, 653795, 1046072, 1307590, 2092144, 2615180, 4184288, 5230360, 10460720, 20921440]

約数ペア:

[(1, 20921440), (2, 10460720), (4, 5230360), (5, 4184288), (8, 2615180), (10, 2092144), (16, 1307590), (20, 1046072), (32, 653795), (40, 523036), (80, 261518), (160, 130759), (229, 91360), (458, 45680), (571, 36640), (916, 22840), (1142, 18320), (1145, 18272), (1832, 11420), (2284, 9160), (2290, 9136), (2855, 7328), (3664, 5710), (4568, 4580)]