21155020

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{149}}^1\times {\mathrm{229}}^1$

素因数の和:418

約数の個数: 48

約数和(自身を含む): 46368000

約数和(自身を除く): 25212980

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 149, 155, 229, 298, 310, 458, 596, 620, 745, 916, 1145, 1490, 2290, 2980, 4580, 4619, 7099, 9238, 14198, 18476, 23095, 28396, 34121, 35495, 46190, 68242, 70990, 92380, 136484, 141980, 170605, 341210, 682420, 1057751, 2115502, 4231004, 5288755, 10577510, 21155020]

約数ペア:

[(1, 21155020), (2, 10577510), (4, 5288755), (5, 4231004), (10, 2115502), (20, 1057751), (31, 682420), (62, 341210), (124, 170605), (149, 141980), (155, 136484), (229, 92380), (298, 70990), (310, 68242), (458, 46190), (596, 35495), (620, 34121), (745, 28396), (916, 23095), (1145, 18476), (1490, 14198), (2290, 9238), (2980, 7099), (4580, 4619)]