21691420

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{149}}^1\times {\mathrm{251}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 25936580

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 149, 251, 290, 298, 502, 580, 596, 745, 1004, 1255, 1490, 2510, 2980, 4321, 5020, 7279, 8642, 14558, 17284, 21605, 29116, 36395, 37399, 43210, 72790, 74798, 86420, 145580, 149596, 186995, 373990, 747980, 1084571, 2169142, 4338284, 5422855, 10845710, 21691420]

約数ペア:

[(1, 21691420), (2, 10845710), (4, 5422855), (5, 4338284), (10, 2169142), (20, 1084571), (29, 747980), (58, 373990), (116, 186995), (145, 149596), (149, 145580), (251, 86420), (290, 74798), (298, 72790), (502, 43210), (580, 37399), (596, 36395), (745, 29116), (1004, 21605), (1255, 17284), (1490, 14558), (2510, 8642), (2980, 7279), (4321, 5020)]