21057995

素因数分解:

$5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{101}}^1$

素因数の和:180

約数の個数: 48

約数和(自身を含む): 31814208

約数和(自身を除く): 10756213

約数列:

[1, 5, 7, 23, 35, 37, 49, 101, 115, 161, 185, 245, 259, 505, 707, 805, 851, 1127, 1295, 1813, 2323, 3535, 3737, 4255, 4949, 5635, 5957, 9065, 11615, 16261, 18685, 24745, 26159, 29785, 41699, 81305, 85951, 113827, 130795, 183113, 208495, 429755, 569135, 601657, 915565, 3008285, 4211599, 21057995]

約数ペア:

[(1, 21057995), (5, 4211599), (7, 3008285), (23, 915565), (35, 601657), (37, 569135), (49, 429755), (101, 208495), (115, 183113), (161, 130795), (185, 113827), (245, 85951), (259, 81305), (505, 41699), (707, 29785), (805, 26159), (851, 24745), (1127, 18685), (1295, 16261), (1813, 11615), (2323, 9065), (3535, 5957), (3737, 5635), (4255, 4949)]